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Finding the Fourth Proportional to 86,478.92, 129,768.40 and 36,555.80

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Solution

The fourth proportional to 86,478.92, 129,768.40 and 36,555.80 is: 54,854.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,478.92 : 129,768.40 = 36,555.80 : x
  2. Step 2: Convert to fraction form
    86,478.92/129,768.40 = 36,555.80/x
  3. Step 3: Cross multiply
    86,478.92x = 129,768.40 × 36,555.80
  4. Step 4: Simplify right side
    86,478.92x = 4,743,787,676.72
  5. Step 5: Solve for x
    x = 4,743,787,676.72/86,478.92
  6. Step 6: Final answer
    x = 54,854.84

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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.