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Finding the Fourth Proportional to 84,007.20, 126,010.80 and 80,119.20

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Solution

The fourth proportional to 84,007.20, 126,010.80 and 80,119.20 is: 120,178.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,007.20 : 126,010.80 = 80,119.20 : x
  2. Step 2: Convert to fraction form
    84,007.20/126,010.80 = 80,119.20/x
  3. Step 3: Cross multiply
    84,007.20x = 126,010.80 × 80,119.20
  4. Step 4: Simplify right side
    84,007.20x = 10,095,884,487.36
  5. Step 5: Solve for x
    x = 10,095,884,487.36/84,007.20
  6. Step 6: Final answer
    x = 120,178.80

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1.5x scale

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.