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Finding the Fourth Proportional to 84,019.84, 126,029.76 and 78,887.68

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Solution

The fourth proportional to 84,019.84, 126,029.76 and 78,887.68 is: 118,331.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,019.84 : 126,029.76 = 78,887.68 : x
  2. Step 2: Convert to fraction form
    84,019.84/126,029.76 = 78,887.68/x
  3. Step 3: Cross multiply
    84,019.84x = 126,029.76 × 78,887.68
  4. Step 4: Simplify right side
    84,019.84x = 9,942,195,377.36
  5. Step 5: Solve for x
    x = 9,942,195,377.36/84,019.84
  6. Step 6: Final answer
    x = 118,331.52

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Similar ratio
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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.