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Finding the Fourth Proportional to 1,098.38, 1,645.68 and 665.30

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Solution

The fourth proportional to 1,098.38, 1,645.68 and 665.30 is: 996.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,098.38 : 1,645.68 = 665.30 : x
  2. Step 2: Convert to fraction form
    1,098.38/1,645.68 = 665.30/x
  3. Step 3: Cross multiply
    1,098.38x = 1,645.68 × 665.30
  4. Step 4: Simplify right side
    1,098.38x = 1,094,870.90
  5. Step 5: Solve for x
    x = 1,094,870.90/1,098.38
  6. Step 6: Final answer
    x = 996.81

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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.