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Finding the Fourth Proportional to 86,610.92, 129,858.78 and 31,199.72

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Solution

The fourth proportional to 86,610.92, 129,858.78 and 31,199.72 is: 46,778.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,610.92 : 129,858.78 = 31,199.72 : x
  2. Step 2: Convert to fraction form
    86,610.92/129,858.78 = 31,199.72/x
  3. Step 3: Cross multiply
    86,610.92x = 129,858.78 × 31,199.72
  4. Step 4: Simplify right side
    86,610.92x = 4,051,557,575.54
  5. Step 5: Solve for x
    x = 4,051,557,575.54/86,610.92
  6. Step 6: Final answer
    x = 46,778.83

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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.