Home / 80,738.40-121,237.20-61,039.20

Finding the Fourth Proportional to 80,738.40, 121,237.20 and 61,039.20

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Solution

The fourth proportional to 80,738.40, 121,237.20 and 61,039.20 is: 91,656.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,738.40 : 121,237.20 = 61,039.20 : x
  2. Step 2: Convert to fraction form
    80,738.40/121,237.20 = 61,039.20/x
  3. Step 3: Cross multiply
    80,738.40x = 121,237.20 × 61,039.20
  4. Step 4: Simplify right side
    80,738.40x = 7,400,221,698.24
  5. Step 5: Solve for x
    x = 7,400,221,698.24/80,738.40
  6. Step 6: Final answer
    x = 91,656.78

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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.