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Finding the Fourth Proportional to 757.02, 1,134.78 and 431.70

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Solution

The fourth proportional to 757.02, 1,134.78 and 431.70 is: 647.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    757.02 : 1,134.78 = 431.70 : x
  2. Step 2: Convert to fraction form
    757.02/1,134.78 = 431.70/x
  3. Step 3: Cross multiply
    757.02x = 1,134.78 × 431.70
  4. Step 4: Simplify right side
    757.02x = 489,884.53
  5. Step 5: Solve for x
    x = 489,884.53/757.02
  6. Step 6: Final answer
    x = 647.12

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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.