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Finding the Fourth Proportional to 129,810.82, 179,138.64 and 73,221.79

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Solution

The fourth proportional to 129,810.82, 179,138.64 and 73,221.79 is: 101,045.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,810.82 : 179,138.64 = 73,221.79 : x
  2. Step 2: Convert to fraction form
    129,810.82/179,138.64 = 73,221.79/x
  3. Step 3: Cross multiply
    129,810.82x = 179,138.64 × 73,221.79
  4. Step 4: Simplify right side
    129,810.82x = 13,116,851,878.97
  5. Step 5: Solve for x
    x = 13,116,851,878.97/129,810.82
  6. Step 6: Final answer
    x = 101,045.91

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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.