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Finding the Fourth Proportional to 1,098.39, 1,647.57 and 328.89

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Solution

The fourth proportional to 1,098.39, 1,647.57 and 328.89 is: 493.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,098.39 : 1,647.57 = 328.89 : x
  2. Step 2: Convert to fraction form
    1,098.39/1,647.57 = 328.89/x
  3. Step 3: Cross multiply
    1,098.39x = 1,647.57 × 328.89
  4. Step 4: Simplify right side
    1,098.39x = 541,869.30
  5. Step 5: Solve for x
    x = 541,869.30/1,098.39
  6. Step 6: Final answer
    x = 493.33

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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.