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Finding the Fourth Proportional to 129,921.68, 179,288.52 and 72,559.44

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Solution

The fourth proportional to 129,921.68, 179,288.52 and 72,559.44 is: 100,130.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,921.68 : 179,288.52 = 72,559.44 : x
  2. Step 2: Convert to fraction form
    129,921.68/179,288.52 = 72,559.44/x
  3. Step 3: Cross multiply
    129,921.68x = 179,288.52 × 72,559.44
  4. Step 4: Simplify right side
    129,921.68x = 13,009,074,609.63
  5. Step 5: Solve for x
    x = 13,009,074,609.63/129,921.68
  6. Step 6: Final answer
    x = 100,130.13

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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.