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Finding the Fourth Proportional to 86,548.88, 129,823.32 and 69,129.43

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Solution

The fourth proportional to 86,548.88, 129,823.32 and 69,129.43 is: 103,694.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,548.88 : 129,823.32 = 69,129.43 : x
  2. Step 2: Convert to fraction form
    86,548.88/129,823.32 = 69,129.43/x
  3. Step 3: Cross multiply
    86,548.88x = 129,823.32 × 69,129.43
  4. Step 4: Simplify right side
    86,548.88x = 8,974,612,112.31
  5. Step 5: Solve for x
    x = 8,974,612,112.31/86,548.88
  6. Step 6: Final answer
    x = 103,694.15

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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.