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Finding the Fourth Proportional to 668.58, 1,001.40 and 551.70

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Solution

The fourth proportional to 668.58, 1,001.40 and 551.70 is: 826.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.58 : 1,001.40 = 551.70 : x
  2. Step 2: Convert to fraction form
    668.58/1,001.40 = 551.70/x
  3. Step 3: Cross multiply
    668.58x = 1,001.40 × 551.70
  4. Step 4: Simplify right side
    668.58x = 552,472.38
  5. Step 5: Solve for x
    x = 552,472.38/668.58
  6. Step 6: Final answer
    x = 826.34

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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.