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Finding the Fourth Proportional to 1,397.92, 2,097.54 and 667.72

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Solution

The fourth proportional to 1,397.92, 2,097.54 and 667.72 is: 1,001.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,397.92 : 2,097.54 = 667.72 : x
  2. Step 2: Convert to fraction form
    1,397.92/2,097.54 = 667.72/x
  3. Step 3: Cross multiply
    1,397.92x = 2,097.54 × 667.72
  4. Step 4: Simplify right side
    1,397.92x = 1,400,569.41
  5. Step 5: Solve for x
    x = 1,400,569.41/1,397.92
  6. Step 6: Final answer
    x = 1,001.90

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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.