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Finding the Fourth Proportional to 717.93, 991.20 and 551.85

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Solution

The fourth proportional to 717.93, 991.20 and 551.85 is: 761.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.93 : 991.20 = 551.85 : x
  2. Step 2: Convert to fraction form
    717.93/991.20 = 551.85/x
  3. Step 3: Cross multiply
    717.93x = 991.20 × 551.85
  4. Step 4: Simplify right side
    717.93x = 546,993.72
  5. Step 5: Solve for x
    x = 546,993.72/717.93
  6. Step 6: Final answer
    x = 761.90

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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.