Home / 129,981.12-179,370.64-72,620.88

Finding the Fourth Proportional to 129,981.12, 179,370.64 and 72,620.88

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Solution

The fourth proportional to 129,981.12, 179,370.64 and 72,620.88 is: 100,214.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,981.12 : 179,370.64 = 72,620.88 : x
  2. Step 2: Convert to fraction form
    129,981.12/179,370.64 = 72,620.88/x
  3. Step 3: Cross multiply
    129,981.12x = 179,370.64 × 72,620.88
  4. Step 4: Simplify right side
    129,981.12x = 13,026,053,722.96
  5. Step 5: Solve for x
    x = 13,026,053,722.96/129,981.12
  6. Step 6: Final answer
    x = 100,214.97

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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.