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Finding the Fourth Proportional to 753.35, 1,128.18 and 521.58

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Solution

The fourth proportional to 753.35, 1,128.18 and 521.58 is: 781.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.35 : 1,128.18 = 521.58 : x
  2. Step 2: Convert to fraction form
    753.35/1,128.18 = 521.58/x
  3. Step 3: Cross multiply
    753.35x = 1,128.18 × 521.58
  4. Step 4: Simplify right side
    753.35x = 588,436.12
  5. Step 5: Solve for x
    x = 588,436.12/753.35
  6. Step 6: Final answer
    x = 781.10

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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.