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Finding the Fourth Proportional to 717.30, 990.20 and 551.45

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Solution

The fourth proportional to 717.30, 990.20 and 551.45 is: 761.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.30 : 990.20 = 551.45 : x
  2. Step 2: Convert to fraction form
    717.30/990.20 = 551.45/x
  3. Step 3: Cross multiply
    717.30x = 990.20 × 551.45
  4. Step 4: Simplify right side
    717.30x = 546,043.03
  5. Step 5: Solve for x
    x = 546,043.03/717.30
  6. Step 6: Final answer
    x = 761.25

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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.