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Finding the Fourth Proportional to 1,103.10, 1,521.74 and 660.84

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Solution

The fourth proportional to 1,103.10, 1,521.74 and 660.84 is: 911.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,103.10 : 1,521.74 = 660.84 : x
  2. Step 2: Convert to fraction form
    1,103.10/1,521.74 = 660.84/x
  3. Step 3: Cross multiply
    1,103.10x = 1,521.74 × 660.84
  4. Step 4: Simplify right side
    1,103.10x = 1,005,626.66
  5. Step 5: Solve for x
    x = 1,005,626.66/1,103.10
  6. Step 6: Final answer
    x = 911.64

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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.