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Finding the Fourth Proportional to 1,098.35, 1,647.29 and 318.19

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Solution

The fourth proportional to 1,098.35, 1,647.29 and 318.19 is: 477.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,098.35 : 1,647.29 = 318.19 : x
  2. Step 2: Convert to fraction form
    1,098.35/1,647.29 = 318.19/x
  3. Step 3: Cross multiply
    1,098.35x = 1,647.29 × 318.19
  4. Step 4: Simplify right side
    1,098.35x = 524,141.38
  5. Step 5: Solve for x
    x = 524,141.38/1,098.35
  6. Step 6: Final answer
    x = 477.21

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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.