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Finding the Fourth Proportional to 891.06, 1,229.61 and 517.98

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Solution

The fourth proportional to 891.06, 1,229.61 and 517.98 is: 714.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.06 : 1,229.61 = 517.98 : x
  2. Step 2: Convert to fraction form
    891.06/1,229.61 = 517.98/x
  3. Step 3: Cross multiply
    891.06x = 1,229.61 × 517.98
  4. Step 4: Simplify right side
    891.06x = 636,913.39
  5. Step 5: Solve for x
    x = 636,913.39/891.06
  6. Step 6: Final answer
    x = 714.78

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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.