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Finding the Fourth Proportional to 84,272.40, 126,408.60 and 76,690.80

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Solution

The fourth proportional to 84,272.40, 126,408.60 and 76,690.80 is: 115,036.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,272.40 : 126,408.60 = 76,690.80 : x
  2. Step 2: Convert to fraction form
    84,272.40/126,408.60 = 76,690.80/x
  3. Step 3: Cross multiply
    84,272.40x = 126,408.60 × 76,690.80
  4. Step 4: Simplify right side
    84,272.40x = 9,694,376,660.88
  5. Step 5: Solve for x
    x = 9,694,376,660.88/84,272.40
  6. Step 6: Final answer
    x = 115,036.20

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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.