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Finding the Fourth Proportional to 630.98, 865.07 and 621.39

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Solution

The fourth proportional to 630.98, 865.07 and 621.39 is: 851.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.98 : 865.07 = 621.39 : x
  2. Step 2: Convert to fraction form
    630.98/865.07 = 621.39/x
  3. Step 3: Cross multiply
    630.98x = 865.07 × 621.39
  4. Step 4: Simplify right side
    630.98x = 537,545.85
  5. Step 5: Solve for x
    x = 537,545.85/630.98
  6. Step 6: Final answer
    x = 851.92

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.