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Finding the Fourth Proportional to 129,695.87, 179,063.59 and 81,364.06

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Solution

The fourth proportional to 129,695.87, 179,063.59 and 81,364.06 is: 112,334.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,695.87 : 179,063.59 = 81,364.06 : x
  2. Step 2: Convert to fraction form
    129,695.87/179,063.59 = 81,364.06/x
  3. Step 3: Cross multiply
    129,695.87x = 179,063.59 × 81,364.06
  4. Step 4: Simplify right side
    129,695.87x = 14,569,339,378.44
  5. Step 5: Solve for x
    x = 14,569,339,378.44/129,695.87
  6. Step 6: Final answer
    x = 112,334.65

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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.