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Finding the Fourth Proportional to 717.58, 990.81 and 551.53

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Solution

The fourth proportional to 717.58, 990.81 and 551.53 is: 761.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.58 : 990.81 = 551.53 : x
  2. Step 2: Convert to fraction form
    717.58/990.81 = 551.53/x
  3. Step 3: Cross multiply
    717.58x = 990.81 × 551.53
  4. Step 4: Simplify right side
    717.58x = 546,461.44
  5. Step 5: Solve for x
    x = 546,461.44/717.58
  6. Step 6: Final answer
    x = 761.53

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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.