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Finding the Fourth Proportional to 887.42, 1,331.19 and 423.92

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Solution

The fourth proportional to 887.42, 1,331.19 and 423.92 is: 635.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.42 : 1,331.19 = 423.92 : x
  2. Step 2: Convert to fraction form
    887.42/1,331.19 = 423.92/x
  3. Step 3: Cross multiply
    887.42x = 1,331.19 × 423.92
  4. Step 4: Simplify right side
    887.42x = 564,321.39
  5. Step 5: Solve for x
    x = 564,321.39/887.42
  6. Step 6: Final answer
    x = 635.91

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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.