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Finding the Fourth Proportional to 86,478.76, 129,545.34 and 79,169.32

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Solution

The fourth proportional to 86,478.76, 129,545.34 and 79,169.32 is: 118,595.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,478.76 : 129,545.34 = 79,169.32 : x
  2. Step 2: Convert to fraction form
    86,478.76/129,545.34 = 79,169.32/x
  3. Step 3: Cross multiply
    86,478.76x = 129,545.34 × 79,169.32
  4. Step 4: Simplify right side
    86,478.76x = 10,256,016,476.97
  5. Step 5: Solve for x
    x = 10,256,016,476.97/86,478.76
  6. Step 6: Final answer
    x = 118,595.79

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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.