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Finding the Fourth Proportional to 86,405.72, 129,421.04 and 41,939.02

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Solution

The fourth proportional to 86,405.72, 129,421.04 and 41,939.02 is: 62,817.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,405.72 : 129,421.04 = 41,939.02 : x
  2. Step 2: Convert to fraction form
    86,405.72/129,421.04 = 41,939.02/x
  3. Step 3: Cross multiply
    86,405.72x = 129,421.04 × 41,939.02
  4. Step 4: Simplify right side
    86,405.72x = 5,427,791,584.98
  5. Step 5: Solve for x
    x = 5,427,791,584.98/86,405.72
  6. Step 6: Final answer
    x = 62,817.50

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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.