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Finding the Fourth Proportional to 1,101.97, 1,520.86 and 660.11

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Solution

The fourth proportional to 1,101.97, 1,520.86 and 660.11 is: 911.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,101.97 : 1,520.86 = 660.11 : x
  2. Step 2: Convert to fraction form
    1,101.97/1,520.86 = 660.11/x
  3. Step 3: Cross multiply
    1,101.97x = 1,520.86 × 660.11
  4. Step 4: Simplify right side
    1,101.97x = 1,003,934.89
  5. Step 5: Solve for x
    x = 1,003,934.89/1,101.97
  6. Step 6: Final answer
    x = 911.04

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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.