Home / 721,421.40-1,082,132.10-385,498.20

Finding the Fourth Proportional to 721,421.40, 1,082,132.10 and 385,498.20

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Solution

The fourth proportional to 721,421.40, 1,082,132.10 and 385,498.20 is: 578,247.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,421.40 : 1,082,132.10 = 385,498.20 : x
  2. Step 2: Convert to fraction form
    721,421.40/1,082,132.10 = 385,498.20/x
  3. Step 3: Cross multiply
    721,421.40x = 1,082,132.10 × 385,498.20
  4. Step 4: Simplify right side
    721,421.40x = 417,159,976,712.22
  5. Step 5: Solve for x
    x = 417,159,976,712.22/721,421.40
  6. Step 6: Final answer
    x = 578,247.30

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.