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Finding the Fourth Proportional to 129,900, 179,147.12 and 84,536.22

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Solution

The fourth proportional to 129,900, 179,147.12 and 84,536.22 is: 116,585.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,900 : 179,147.12 = 84,536.22 : x
  2. Step 2: Convert to fraction form
    129,900/179,147.12 = 84,536.22/x
  3. Step 3: Cross multiply
    129,900x = 179,147.12 × 84,536.22
  4. Step 4: Simplify right side
    129,900x = 15,144,419,926.01
  5. Step 5: Solve for x
    x = 15,144,419,926.01/129,900
  6. Step 6: Final answer
    x = 116,585.22

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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.