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Finding the Fourth Proportional to 129,900.62, 179,243.62 and 78,886.76

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Solution

The fourth proportional to 129,900.62, 179,243.62 and 78,886.76 is: 108,852.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,900.62 : 179,243.62 = 78,886.76 : x
  2. Step 2: Convert to fraction form
    129,900.62/179,243.62 = 78,886.76/x
  3. Step 3: Cross multiply
    129,900.62x = 179,243.62 × 78,886.76
  4. Step 4: Simplify right side
    129,900.62x = 14,139,947,339.04
  5. Step 5: Solve for x
    x = 14,139,947,339.04/129,900.62
  6. Step 6: Final answer
    x = 108,852.04

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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.