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Finding the Fourth Proportional to 1,098.05, 1,647.72 and 405.20

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Solution

The fourth proportional to 1,098.05, 1,647.72 and 405.20 is: 608.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,098.05 : 1,647.72 = 405.20 : x
  2. Step 2: Convert to fraction form
    1,098.05/1,647.72 = 405.20/x
  3. Step 3: Cross multiply
    1,098.05x = 1,647.72 × 405.20
  4. Step 4: Simplify right side
    1,098.05x = 667,652.56
  5. Step 5: Solve for x
    x = 667,652.56/1,098.05
  6. Step 6: Final answer
    x = 608.04

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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.