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Finding the Fourth Proportional to 892.39, 1,338.38 and 429.88

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Solution

The fourth proportional to 892.39, 1,338.38 and 429.88 is: 644.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.39 : 1,338.38 = 429.88 : x
  2. Step 2: Convert to fraction form
    892.39/1,338.38 = 429.88/x
  3. Step 3: Cross multiply
    892.39x = 1,338.38 × 429.88
  4. Step 4: Simplify right side
    892.39x = 575,338.91
  5. Step 5: Solve for x
    x = 575,338.91/892.39
  6. Step 6: Final answer
    x = 644.72

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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.