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Finding the Fourth Proportional to 129,751.16, 179,061.91 and 81,987.08

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Solution

The fourth proportional to 129,751.16, 179,061.91 and 81,987.08 is: 113,145.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,751.16 : 179,061.91 = 81,987.08 : x
  2. Step 2: Convert to fraction form
    129,751.16/179,061.91 = 81,987.08/x
  3. Step 3: Cross multiply
    129,751.16x = 179,061.91 × 81,987.08
  4. Step 4: Simplify right side
    129,751.16x = 14,680,762,039.85
  5. Step 5: Solve for x
    x = 14,680,762,039.85/129,751.16
  6. Step 6: Final answer
    x = 113,145.52

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.