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Finding the Fourth Proportional to 660.51, 989.96 and 551.97

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Solution

The fourth proportional to 660.51, 989.96 and 551.97 is: 827.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.51 : 989.96 = 551.97 : x
  2. Step 2: Convert to fraction form
    660.51/989.96 = 551.97/x
  3. Step 3: Cross multiply
    660.51x = 989.96 × 551.97
  4. Step 4: Simplify right side
    660.51x = 546,425.46
  5. Step 5: Solve for x
    x = 546,425.46/660.51
  6. Step 6: Final answer
    x = 827.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.