Home / 280,109.13-420,106.06-80,385

Finding the Fourth Proportional to 280,109.13, 420,106.06 and 80,385

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Solution

The fourth proportional to 280,109.13, 420,106.06 and 80,385 is: 120,560.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,109.13 : 420,106.06 = 80,385 : x
  2. Step 2: Convert to fraction form
    280,109.13/420,106.06 = 80,385/x
  3. Step 3: Cross multiply
    280,109.13x = 420,106.06 × 80,385
  4. Step 4: Simplify right side
    280,109.13x = 33,770,225,432.14
  5. Step 5: Solve for x
    x = 33,770,225,432.14/280,109.13
  6. Step 6: Final answer
    x = 120,560.96

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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.