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Finding the Fourth Proportional to 138,959.75, 191,765.12 and 75,297.66

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Solution

The fourth proportional to 138,959.75, 191,765.12 and 75,297.66 is: 103,911.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,959.75 : 191,765.12 = 75,297.66 : x
  2. Step 2: Convert to fraction form
    138,959.75/191,765.12 = 75,297.66/x
  3. Step 3: Cross multiply
    138,959.75x = 191,765.12 × 75,297.66
  4. Step 4: Simplify right side
    138,959.75x = 14,439,464,805.62
  5. Step 5: Solve for x
    x = 14,439,464,805.62/138,959.75
  6. Step 6: Final answer
    x = 103,911.13

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1.5x scale

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.