Home / 90,721.20-136,081.80-80,698.80

Finding the Fourth Proportional to 90,721.20, 136,081.80 and 80,698.80

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Solution

The fourth proportional to 90,721.20, 136,081.80 and 80,698.80 is: 121,048.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,721.20 : 136,081.80 = 80,698.80 : x
  2. Step 2: Convert to fraction form
    90,721.20/136,081.80 = 80,698.80/x
  3. Step 3: Cross multiply
    90,721.20x = 136,081.80 × 80,698.80
  4. Step 4: Simplify right side
    90,721.20x = 10,981,637,961.84
  5. Step 5: Solve for x
    x = 10,981,637,961.84/90,721.20
  6. Step 6: Final answer
    x = 121,048.20

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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.