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Finding the Fourth Proportional to 14,321.28, 21,488.64 and 8,489.28

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Solution

The fourth proportional to 14,321.28, 21,488.64 and 8,489.28 is: 12,737.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,321.28 : 21,488.64 = 8,489.28 : x
  2. Step 2: Convert to fraction form
    14,321.28/21,488.64 = 8,489.28/x
  3. Step 3: Cross multiply
    14,321.28x = 21,488.64 × 8,489.28
  4. Step 4: Simplify right side
    14,321.28x = 182,423,081.78
  5. Step 5: Solve for x
    x = 182,423,081.78/14,321.28
  6. Step 6: Final answer
    x = 12,737.90

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1.5x scale

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.