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Finding the Fourth Proportional to 86,115.78, 129,103.97 and 26,920.98

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Solution

The fourth proportional to 86,115.78, 129,103.97 and 26,920.98 is: 40,359.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,115.78 : 129,103.97 = 26,920.98 : x
  2. Step 2: Convert to fraction form
    86,115.78/129,103.97 = 26,920.98/x
  3. Step 3: Cross multiply
    86,115.78x = 129,103.97 × 26,920.98
  4. Step 4: Simplify right side
    86,115.78x = 3,475,605,259.69
  5. Step 5: Solve for x
    x = 3,475,605,259.69/86,115.78
  6. Step 6: Final answer
    x = 40,359.68

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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.