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Finding the Fourth Proportional to 129,903.74, 179,247.93 and 78,889.88

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Solution

The fourth proportional to 129,903.74, 179,247.93 and 78,889.88 is: 108,856.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,903.74 : 179,247.93 = 78,889.88 : x
  2. Step 2: Convert to fraction form
    129,903.74/179,247.93 = 78,889.88/x
  3. Step 3: Cross multiply
    129,903.74x = 179,247.93 × 78,889.88
  4. Step 4: Simplify right side
    129,903.74x = 14,140,847,687.95
  5. Step 5: Solve for x
    x = 14,140,847,687.95/129,903.74
  6. Step 6: Final answer
    x = 108,856.36

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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.