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Finding the Fourth Proportional to 1,102.76, 1,521.75 and 660.90

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Solution

The fourth proportional to 1,102.76, 1,521.75 and 660.90 is: 912.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,102.76 : 1,521.75 = 660.90 : x
  2. Step 2: Convert to fraction form
    1,102.76/1,521.75 = 660.90/x
  3. Step 3: Cross multiply
    1,102.76x = 1,521.75 × 660.90
  4. Step 4: Simplify right side
    1,102.76x = 1,005,724.58
  5. Step 5: Solve for x
    x = 1,005,724.58/1,102.76
  6. Step 6: Final answer
    x = 912.01

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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.