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Finding the Fourth Proportional to 887.60, 1,331.91 and 640.55

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Solution

The fourth proportional to 887.60, 1,331.91 and 640.55 is: 961.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.60 : 1,331.91 = 640.55 : x
  2. Step 2: Convert to fraction form
    887.60/1,331.91 = 640.55/x
  3. Step 3: Cross multiply
    887.60x = 1,331.91 × 640.55
  4. Step 4: Simplify right side
    887.60x = 853,154.95
  5. Step 5: Solve for x
    x = 853,154.95/887.60
  6. Step 6: Final answer
    x = 961.19

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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.