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Finding the Fourth Proportional to 139,805.80, 192,934.20 and 76,143.56

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Solution

The fourth proportional to 139,805.80, 192,934.20 and 76,143.56 is: 105,079.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,805.80 : 192,934.20 = 76,143.56 : x
  2. Step 2: Convert to fraction form
    139,805.80/192,934.20 = 76,143.56/x
  3. Step 3: Cross multiply
    139,805.80x = 192,934.20 × 76,143.56
  4. Step 4: Simplify right side
    139,805.80x = 14,690,696,833.75
  5. Step 5: Solve for x
    x = 14,690,696,833.75/139,805.80
  6. Step 6: Final answer
    x = 105,079.31

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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.