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Finding the Fourth Proportional to 1,016.57, 1,523.75 and 431.43

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Solution

The fourth proportional to 1,016.57, 1,523.75 and 431.43 is: 646.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,016.57 : 1,523.75 = 431.43 : x
  2. Step 2: Convert to fraction form
    1,016.57/1,523.75 = 431.43/x
  3. Step 3: Cross multiply
    1,016.57x = 1,523.75 × 431.43
  4. Step 4: Simplify right side
    1,016.57x = 657,391.46
  5. Step 5: Solve for x
    x = 657,391.46/1,016.57
  6. Step 6: Final answer
    x = 646.68

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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.