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Finding the Fourth Proportional to 81,082.86, 121,623.45 and 25,678.86

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Solution

The fourth proportional to 81,082.86, 121,623.45 and 25,678.86 is: 38,518.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,082.86 : 121,623.45 = 25,678.86 : x
  2. Step 2: Convert to fraction form
    81,082.86/121,623.45 = 25,678.86/x
  3. Step 3: Cross multiply
    81,082.86x = 121,623.45 × 25,678.86
  4. Step 4: Simplify right side
    81,082.86x = 3,123,151,545.27
  5. Step 5: Solve for x
    x = 3,123,151,545.27/81,082.86
  6. Step 6: Final answer
    x = 38,518.02

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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.