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Finding the Fourth Proportional to 717.36, 990.43 and 551.27

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Solution

The fourth proportional to 717.36, 990.43 and 551.27 is: 761.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.36 : 990.43 = 551.27 : x
  2. Step 2: Convert to fraction form
    717.36/990.43 = 551.27/x
  3. Step 3: Cross multiply
    717.36x = 990.43 × 551.27
  4. Step 4: Simplify right side
    717.36x = 545,994.35
  5. Step 5: Solve for x
    x = 545,994.35/717.36
  6. Step 6: Final answer
    x = 761.12

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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.