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Finding the Fourth Proportional to 639.52, 962.65 and 545.56

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Solution

The fourth proportional to 639.52, 962.65 and 545.56 is: 821.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.52 : 962.65 = 545.56 : x
  2. Step 2: Convert to fraction form
    639.52/962.65 = 545.56/x
  3. Step 3: Cross multiply
    639.52x = 962.65 × 545.56
  4. Step 4: Simplify right side
    639.52x = 525,181.61
  5. Step 5: Solve for x
    x = 525,181.61/639.52
  6. Step 6: Final answer
    x = 821.22

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.