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Finding the Fourth Proportional to 932.98, 1,398.67 and 521.78

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Solution

The fourth proportional to 932.98, 1,398.67 and 521.78 is: 782.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    932.98 : 1,398.67 = 521.78 : x
  2. Step 2: Convert to fraction form
    932.98/1,398.67 = 521.78/x
  3. Step 3: Cross multiply
    932.98x = 1,398.67 × 521.78
  4. Step 4: Simplify right side
    932.98x = 729,798.03
  5. Step 5: Solve for x
    x = 729,798.03/932.98
  6. Step 6: Final answer
    x = 782.22

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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.