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Finding the Fourth Proportional to 529.68, 731.92 and 389.56

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Solution

The fourth proportional to 529.68, 731.92 and 389.56 is: 538.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    529.68 : 731.92 = 389.56 : x
  2. Step 2: Convert to fraction form
    529.68/731.92 = 389.56/x
  3. Step 3: Cross multiply
    529.68x = 731.92 × 389.56
  4. Step 4: Simplify right side
    529.68x = 285,126.76
  5. Step 5: Solve for x
    x = 285,126.76/529.68
  6. Step 6: Final answer
    x = 538.30

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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.