Home / 781,421.40-1,172,132.10-445,498.20

Finding the Fourth Proportional to 781,421.40, 1,172,132.10 and 445,498.20

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Solution

The fourth proportional to 781,421.40, 1,172,132.10 and 445,498.20 is: 668,247.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    781,421.40 : 1,172,132.10 = 445,498.20 : x
  2. Step 2: Convert to fraction form
    781,421.40/1,172,132.10 = 445,498.20/x
  3. Step 3: Cross multiply
    781,421.40x = 1,172,132.10 × 445,498.20
  4. Step 4: Simplify right side
    781,421.40x = 522,182,740,712.22
  5. Step 5: Solve for x
    x = 522,182,740,712.22/781,421.40
  6. Step 6: Final answer
    x = 668,247.30

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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.