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Finding the Fourth Proportional to 81,979.80, 122,948.10 and 25,819.80

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Solution

The fourth proportional to 81,979.80, 122,948.10 and 25,819.80 is: 38,722.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,979.80 : 122,948.10 = 25,819.80 : x
  2. Step 2: Convert to fraction form
    81,979.80/122,948.10 = 25,819.80/x
  3. Step 3: Cross multiply
    81,979.80x = 122,948.10 × 25,819.80
  4. Step 4: Simplify right side
    81,979.80x = 3,174,495,352.38
  5. Step 5: Solve for x
    x = 3,174,495,352.38/81,979.80
  6. Step 6: Final answer
    x = 38,722.90

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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.