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Finding the Fourth Proportional to 951.12, 1,426.68 and 431.30

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Solution

The fourth proportional to 951.12, 1,426.68 and 431.30 is: 646.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    951.12 : 1,426.68 = 431.30 : x
  2. Step 2: Convert to fraction form
    951.12/1,426.68 = 431.30/x
  3. Step 3: Cross multiply
    951.12x = 1,426.68 × 431.30
  4. Step 4: Simplify right side
    951.12x = 615,319.95
  5. Step 5: Solve for x
    x = 615,319.95/951.12
  6. Step 6: Final answer
    x = 646.94

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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.