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Finding the Fourth Proportional to 717, 989.78 and 551.88

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Solution

The fourth proportional to 717, 989.78 and 551.88 is: 761.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    717 : 989.78 = 551.88 : x
  2. Step 2: Convert to fraction form
    717/989.78 = 551.88/x
  3. Step 3: Cross multiply
    717x = 989.78 × 551.88
  4. Step 4: Simplify right side
    717x = 546,239.79
  5. Step 5: Solve for x
    x = 546,239.79/717
  6. Step 6: Final answer
    x = 761.84

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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.