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Finding the Fourth Proportional to 887.79, 1,331.43 and 425.12

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Solution

The fourth proportional to 887.79, 1,331.43 and 425.12 is: 637.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.79 : 1,331.43 = 425.12 : x
  2. Step 2: Convert to fraction form
    887.79/1,331.43 = 425.12/x
  3. Step 3: Cross multiply
    887.79x = 1,331.43 × 425.12
  4. Step 4: Simplify right side
    887.79x = 566,010.86
  5. Step 5: Solve for x
    x = 566,010.86/887.79
  6. Step 6: Final answer
    x = 637.55

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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.