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Finding the Fourth Proportional to 28,854.78, 39,815.19 and 18,258.90

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Solution

The fourth proportional to 28,854.78, 39,815.19 and 18,258.90 is: 25,194.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,854.78 : 39,815.19 = 18,258.90 : x
  2. Step 2: Convert to fraction form
    28,854.78/39,815.19 = 18,258.90/x
  3. Step 3: Cross multiply
    28,854.78x = 39,815.19 × 18,258.90
  4. Step 4: Simplify right side
    28,854.78x = 726,981,572.69
  5. Step 5: Solve for x
    x = 726,981,572.69/28,854.78
  6. Step 6: Final answer
    x = 25,194.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.