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Finding the Fourth Proportional to 742.71, 1,024.94 and 411.12

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Solution

The fourth proportional to 742.71, 1,024.94 and 411.12 is: 567.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.71 : 1,024.94 = 411.12 : x
  2. Step 2: Convert to fraction form
    742.71/1,024.94 = 411.12/x
  3. Step 3: Cross multiply
    742.71x = 1,024.94 × 411.12
  4. Step 4: Simplify right side
    742.71x = 421,371.28
  5. Step 5: Solve for x
    x = 421,371.28/742.71
  6. Step 6: Final answer
    x = 567.34

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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.