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Finding the Fourth Proportional to 3,147.42, 4,343.92 and 1,821.10

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Solution

The fourth proportional to 3,147.42, 4,343.92 and 1,821.10 is: 2,513.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,147.42 : 4,343.92 = 1,821.10 : x
  2. Step 2: Convert to fraction form
    3,147.42/4,343.92 = 1,821.10/x
  3. Step 3: Cross multiply
    3,147.42x = 4,343.92 × 1,821.10
  4. Step 4: Simplify right side
    3,147.42x = 7,910,712.71
  5. Step 5: Solve for x
    x = 7,910,712.71/3,147.42
  6. Step 6: Final answer
    x = 2,513.40

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Half scale
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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.