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Finding the Fourth Proportional to 621.90, 937.72 and 545.10

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Solution

The fourth proportional to 621.90, 937.72 and 545.10 is: 821.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.90 : 937.72 = 545.10 : x
  2. Step 2: Convert to fraction form
    621.90/937.72 = 545.10/x
  3. Step 3: Cross multiply
    621.90x = 937.72 × 545.10
  4. Step 4: Simplify right side
    621.90x = 511,151.17
  5. Step 5: Solve for x
    x = 511,151.17/621.90
  6. Step 6: Final answer
    x = 821.92

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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.