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Finding the Fourth Proportional to 86,493.80, 129,837.90 and 66,859.40

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Solution

The fourth proportional to 86,493.80, 129,837.90 and 66,859.40 is: 100,364.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,493.80 : 129,837.90 = 66,859.40 : x
  2. Step 2: Convert to fraction form
    86,493.80/129,837.90 = 66,859.40/x
  3. Step 3: Cross multiply
    86,493.80x = 129,837.90 × 66,859.40
  4. Step 4: Simplify right side
    86,493.80x = 8,680,884,091.26
  5. Step 5: Solve for x
    x = 8,680,884,091.26/86,493.80
  6. Step 6: Final answer
    x = 100,364.24

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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.