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Finding the Fourth Proportional to 639.27, 881.33 and 545.63

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Solution

The fourth proportional to 639.27, 881.33 and 545.63 is: 752.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.27 : 881.33 = 545.63 : x
  2. Step 2: Convert to fraction form
    639.27/881.33 = 545.63/x
  3. Step 3: Cross multiply
    639.27x = 881.33 × 545.63
  4. Step 4: Simplify right side
    639.27x = 480,872.95
  5. Step 5: Solve for x
    x = 480,872.95/639.27
  6. Step 6: Final answer
    x = 752.22

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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.