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Finding the Fourth Proportional to 1,318.88, 1,978.22 and 453.20

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Solution

The fourth proportional to 1,318.88, 1,978.22 and 453.20 is: 679.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.88 : 1,978.22 = 453.20 : x
  2. Step 2: Convert to fraction form
    1,318.88/1,978.22 = 453.20/x
  3. Step 3: Cross multiply
    1,318.88x = 1,978.22 × 453.20
  4. Step 4: Simplify right side
    1,318.88x = 896,520.55
  5. Step 5: Solve for x
    x = 896,520.55/1,318.88
  6. Step 6: Final answer
    x = 679.76

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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.