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Finding the Fourth Proportional to 129,779.68, 179,098.56 and 73,180

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Solution

The fourth proportional to 129,779.68, 179,098.56 and 73,180 is: 100,989.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,779.68 : 179,098.56 = 73,180 : x
  2. Step 2: Convert to fraction form
    129,779.68/179,098.56 = 73,180/x
  3. Step 3: Cross multiply
    129,779.68x = 179,098.56 × 73,180
  4. Step 4: Simplify right side
    129,779.68x = 13,106,432,620.80
  5. Step 5: Solve for x
    x = 13,106,432,620.80/129,779.68
  6. Step 6: Final answer
    x = 100,989.87

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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.