Home / 129,231.75-178,338.06-72,643.26

Finding the Fourth Proportional to 129,231.75, 178,338.06 and 72,643.26

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Solution

The fourth proportional to 129,231.75, 178,338.06 and 72,643.26 is: 100,246.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,231.75 : 178,338.06 = 72,643.26 : x
  2. Step 2: Convert to fraction form
    129,231.75/178,338.06 = 72,643.26/x
  3. Step 3: Cross multiply
    129,231.75x = 178,338.06 × 72,643.26
  4. Step 4: Simplify right side
    129,231.75x = 12,955,058,060.48
  5. Step 5: Solve for x
    x = 12,955,058,060.48/129,231.75
  6. Step 6: Final answer
    x = 100,246.71

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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.