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Finding the Fourth Proportional to 951.20, 1,426.79 and 438.20

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Solution

The fourth proportional to 951.20, 1,426.79 and 438.20 is: 657.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    951.20 : 1,426.79 = 438.20 : x
  2. Step 2: Convert to fraction form
    951.20/1,426.79 = 438.20/x
  3. Step 3: Cross multiply
    951.20x = 1,426.79 × 438.20
  4. Step 4: Simplify right side
    951.20x = 625,210.05
  5. Step 5: Solve for x
    x = 625,210.05/951.20
  6. Step 6: Final answer
    x = 657.29

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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.