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Finding the Fourth Proportional to 86,390, 129,529.68 and 36,456.56

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Solution

The fourth proportional to 86,390, 129,529.68 and 36,456.56 is: 54,661.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,390 : 129,529.68 = 36,456.56 : x
  2. Step 2: Convert to fraction form
    86,390/129,529.68 = 36,456.56/x
  3. Step 3: Cross multiply
    86,390x = 129,529.68 × 36,456.56
  4. Step 4: Simplify right side
    86,390x = 4,722,206,550.70
  5. Step 5: Solve for x
    x = 4,722,206,550.70/86,390
  6. Step 6: Final answer
    x = 54,661.49

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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.