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Finding the Fourth Proportional to 1,102.40, 1,521.35 and 660.75

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Solution

The fourth proportional to 1,102.40, 1,521.35 and 660.75 is: 911.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,102.40 : 1,521.35 = 660.75 : x
  2. Step 2: Convert to fraction form
    1,102.40/1,521.35 = 660.75/x
  3. Step 3: Cross multiply
    1,102.40x = 1,521.35 × 660.75
  4. Step 4: Simplify right side
    1,102.40x = 1,005,232.01
  5. Step 5: Solve for x
    x = 1,005,232.01/1,102.40
  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.