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Finding the Fourth Proportional to 1,057.91, 1,587.32 and 409.10

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Solution

The fourth proportional to 1,057.91, 1,587.32 and 409.10 is: 613.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,057.91 : 1,587.32 = 409.10 : x
  2. Step 2: Convert to fraction form
    1,057.91/1,587.32 = 409.10/x
  3. Step 3: Cross multiply
    1,057.91x = 1,587.32 × 409.10
  4. Step 4: Simplify right side
    1,057.91x = 649,372.61
  5. Step 5: Solve for x
    x = 649,372.61/1,057.91
  6. Step 6: Final answer
    x = 613.83

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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.