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Finding the Fourth Proportional to 1,098.08, 1,647.38 and 405.12

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Solution

The fourth proportional to 1,098.08, 1,647.38 and 405.12 is: 607.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,098.08 : 1,647.38 = 405.12 : x
  2. Step 2: Convert to fraction form
    1,098.08/1,647.38 = 405.12/x
  3. Step 3: Cross multiply
    1,098.08x = 1,647.38 × 405.12
  4. Step 4: Simplify right side
    1,098.08x = 667,386.59
  5. Step 5: Solve for x
    x = 667,386.59/1,098.08
  6. Step 6: Final answer
    x = 607.78

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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.