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Finding the Fourth Proportional to 18,715.80, 28,073.64 and 12,854.64

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Solution

The fourth proportional to 18,715.80, 28,073.64 and 12,854.64 is: 19,281.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,715.80 : 28,073.64 = 12,854.64 : x
  2. Step 2: Convert to fraction form
    18,715.80/28,073.64 = 12,854.64/x
  3. Step 3: Cross multiply
    18,715.80x = 28,073.64 × 12,854.64
  4. Step 4: Simplify right side
    18,715.80x = 360,876,535.69
  5. Step 5: Solve for x
    x = 360,876,535.69/18,715.80
  6. Step 6: Final answer
    x = 19,281.92

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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.