Home / 138,821.12-208,338.64-72,278

Finding the Fourth Proportional to 138,821.12, 208,338.64 and 72,278

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Solution

The fourth proportional to 138,821.12, 208,338.64 and 72,278 is: 108,472.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,821.12 : 208,338.64 = 72,278 : x
  2. Step 2: Convert to fraction form
    138,821.12/208,338.64 = 72,278/x
  3. Step 3: Cross multiply
    138,821.12x = 208,338.64 × 72,278
  4. Step 4: Simplify right side
    138,821.12x = 15,058,300,221.92
  5. Step 5: Solve for x
    x = 15,058,300,221.92/138,821.12
  6. Step 6: Final answer
    x = 108,472.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.