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Finding the Fourth Proportional to 1,098.45, 1,647.86 and 329.13

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Solution

The fourth proportional to 1,098.45, 1,647.86 and 329.13 is: 493.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,098.45 : 1,647.86 = 329.13 : x
  2. Step 2: Convert to fraction form
    1,098.45/1,647.86 = 329.13/x
  3. Step 3: Cross multiply
    1,098.45x = 1,647.86 × 329.13
  4. Step 4: Simplify right side
    1,098.45x = 542,358.52
  5. Step 5: Solve for x
    x = 542,358.52/1,098.45
  6. Step 6: Final answer
    x = 493.75

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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.