Home / 280,828.80-421,243.20-81,155.70

Finding the Fourth Proportional to 280,828.80, 421,243.20 and 81,155.70

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Solution

The fourth proportional to 280,828.80, 421,243.20 and 81,155.70 is: 121,733.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,828.80 : 421,243.20 = 81,155.70 : x
  2. Step 2: Convert to fraction form
    280,828.80/421,243.20 = 81,155.70/x
  3. Step 3: Cross multiply
    280,828.80x = 421,243.20 × 81,155.70
  4. Step 4: Simplify right side
    280,828.80x = 34,186,286,766.24
  5. Step 5: Solve for x
    x = 34,186,286,766.24/280,828.80
  6. Step 6: Final answer
    x = 121,733.55

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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.