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Finding the Fourth Proportional to 86,079.65, 129,137.76 and 26,919.79

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Solution

The fourth proportional to 86,079.65, 129,137.76 and 26,919.79 is: 40,385.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,079.65 : 129,137.76 = 26,919.79 : x
  2. Step 2: Convert to fraction form
    86,079.65/129,137.76 = 26,919.79/x
  3. Step 3: Cross multiply
    86,079.65x = 129,137.76 × 26,919.79
  4. Step 4: Simplify right side
    86,079.65x = 3,476,361,380.27
  5. Step 5: Solve for x
    x = 3,476,361,380.27/86,079.65
  6. Step 6: Final answer
    x = 40,385.40

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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.