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Finding the Fourth Proportional to 951.80, 1,428.03 and 431.73

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Solution

The fourth proportional to 951.80, 1,428.03 and 431.73 is: 647.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    951.80 : 1,428.03 = 431.73 : x
  2. Step 2: Convert to fraction form
    951.80/1,428.03 = 431.73/x
  3. Step 3: Cross multiply
    951.80x = 1,428.03 × 431.73
  4. Step 4: Simplify right side
    951.80x = 616,523.39
  5. Step 5: Solve for x
    x = 616,523.39/951.80
  6. Step 6: Final answer
    x = 647.75

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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.