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Finding the Fourth Proportional to 908.66, 1,363.46 and 421.71

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Solution

The fourth proportional to 908.66, 1,363.46 and 421.71 is: 632.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.66 : 1,363.46 = 421.71 : x
  2. Step 2: Convert to fraction form
    908.66/1,363.46 = 421.71/x
  3. Step 3: Cross multiply
    908.66x = 1,363.46 × 421.71
  4. Step 4: Simplify right side
    908.66x = 574,982.61
  5. Step 5: Solve for x
    x = 574,982.61/908.66
  6. Step 6: Final answer
    x = 632.78

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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.