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Finding the Fourth Proportional to 717.55, 990.54 and 551.70

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Solution

The fourth proportional to 717.55, 990.54 and 551.70 is: 761.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.55 : 990.54 = 551.70 : x
  2. Step 2: Convert to fraction form
    717.55/990.54 = 551.70/x
  3. Step 3: Cross multiply
    717.55x = 990.54 × 551.70
  4. Step 4: Simplify right side
    717.55x = 546,480.92
  5. Step 5: Solve for x
    x = 546,480.92/717.55
  6. Step 6: Final answer
    x = 761.59

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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.