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Finding the Fourth Proportional to 629.12, 938.88 and 529.92

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Solution

The fourth proportional to 629.12, 938.88 and 529.92 is: 790.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.12 : 938.88 = 529.92 : x
  2. Step 2: Convert to fraction form
    629.12/938.88 = 529.92/x
  3. Step 3: Cross multiply
    629.12x = 938.88 × 529.92
  4. Step 4: Simplify right side
    629.12x = 497,531.29
  5. Step 5: Solve for x
    x = 497,531.29/629.12
  6. Step 6: Final answer
    x = 790.84

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.