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Finding the Fourth Proportional to 892.52, 1,229.99 and 643.39

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Solution

The fourth proportional to 892.52, 1,229.99 and 643.39 is: 886.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.52 : 1,229.99 = 643.39 : x
  2. Step 2: Convert to fraction form
    892.52/1,229.99 = 643.39/x
  3. Step 3: Cross multiply
    892.52x = 1,229.99 × 643.39
  4. Step 4: Simplify right side
    892.52x = 791,363.89
  5. Step 5: Solve for x
    x = 791,363.89/892.52
  6. Step 6: Final answer
    x = 886.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.