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Finding the Fourth Proportional to 84,368.80, 126,380.40 and 42,839.20

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Solution

The fourth proportional to 84,368.80, 126,380.40 and 42,839.20 is: 64,171.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,368.80 : 126,380.40 = 42,839.20 : x
  2. Step 2: Convert to fraction form
    84,368.80/126,380.40 = 42,839.20/x
  3. Step 3: Cross multiply
    84,368.80x = 126,380.40 × 42,839.20
  4. Step 4: Simplify right side
    84,368.80x = 5,414,035,231.68
  5. Step 5: Solve for x
    x = 5,414,035,231.68/84,368.80
  6. Step 6: Final answer
    x = 64,171.06

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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.