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Finding the Fourth Proportional to 1,099.10, 1,648.38 and 660.08

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Solution

The fourth proportional to 1,099.10, 1,648.38 and 660.08 is: 989.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,099.10 : 1,648.38 = 660.08 : x
  2. Step 2: Convert to fraction form
    1,099.10/1,648.38 = 660.08/x
  3. Step 3: Cross multiply
    1,099.10x = 1,648.38 × 660.08
  4. Step 4: Simplify right side
    1,099.10x = 1,088,062.67
  5. Step 5: Solve for x
    x = 1,088,062.67/1,099.10
  6. Step 6: Final answer
    x = 989.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.