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Finding the Fourth Proportional to 1,098.55, 1,647.87 and 318.58

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Solution

The fourth proportional to 1,098.55, 1,647.87 and 318.58 is: 477.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,098.55 : 1,647.87 = 318.58 : x
  2. Step 2: Convert to fraction form
    1,098.55/1,647.87 = 318.58/x
  3. Step 3: Cross multiply
    1,098.55x = 1,647.87 × 318.58
  4. Step 4: Simplify right side
    1,098.55x = 524,978.42
  5. Step 5: Solve for x
    x = 524,978.42/1,098.55
  6. Step 6: Final answer
    x = 477.88

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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.