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Finding the Fourth Proportional to 935.18, 1,290.02 and 542.15

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Solution

The fourth proportional to 935.18, 1,290.02 and 542.15 is: 747.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.18 : 1,290.02 = 542.15 : x
  2. Step 2: Convert to fraction form
    935.18/1,290.02 = 542.15/x
  3. Step 3: Cross multiply
    935.18x = 1,290.02 × 542.15
  4. Step 4: Simplify right side
    935.18x = 699,375.18
  5. Step 5: Solve for x
    x = 699,375.18/935.18
  6. Step 6: Final answer
    x = 747.85

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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.