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Finding the Fourth Proportional to 1,102.69, 1,521.87 and 660.70

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Solution

The fourth proportional to 1,102.69, 1,521.87 and 660.70 is: 911.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,102.69 : 1,521.87 = 660.70 : x
  2. Step 2: Convert to fraction form
    1,102.69/1,521.87 = 660.70/x
  3. Step 3: Cross multiply
    1,102.69x = 1,521.87 × 660.70
  4. Step 4: Simplify right side
    1,102.69x = 1,005,491.90
  5. Step 5: Solve for x
    x = 1,005,491.90/1,102.69
  6. Step 6: Final answer
    x = 911.86

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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.