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Finding the Fourth Proportional to 716.31, 987.72 and 550.91

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Solution

The fourth proportional to 716.31, 987.72 and 550.91 is: 759.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.31 : 987.72 = 550.91 : x
  2. Step 2: Convert to fraction form
    716.31/987.72 = 550.91/x
  3. Step 3: Cross multiply
    716.31x = 987.72 × 550.91
  4. Step 4: Simplify right side
    716.31x = 544,144.83
  5. Step 5: Solve for x
    x = 544,144.83/716.31
  6. Step 6: Final answer
    x = 759.65

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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.