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Finding the Fourth Proportional to 1,099.72, 1,517.10 and 657.58

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Solution

The fourth proportional to 1,099.72, 1,517.10 and 657.58 is: 907.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,099.72 : 1,517.10 = 657.58 : x
  2. Step 2: Convert to fraction form
    1,099.72/1,517.10 = 657.58/x
  3. Step 3: Cross multiply
    1,099.72x = 1,517.10 × 657.58
  4. Step 4: Simplify right side
    1,099.72x = 997,614.62
  5. Step 5: Solve for x
    x = 997,614.62/1,099.72
  6. Step 6: Final answer
    x = 907.15

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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.