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Finding the Fourth Proportional to 84,081.62, 126,118.78 and 20,900.40

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Solution

The fourth proportional to 84,081.62, 126,118.78 and 20,900.40 is: 31,349.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,081.62 : 126,118.78 = 20,900.40 : x
  2. Step 2: Convert to fraction form
    84,081.62/126,118.78 = 20,900.40/x
  3. Step 3: Cross multiply
    84,081.62x = 126,118.78 × 20,900.40
  4. Step 4: Simplify right side
    84,081.62x = 2,635,932,949.51
  5. Step 5: Solve for x
    x = 2,635,932,949.51/84,081.62
  6. Step 6: Final answer
    x = 31,349.69

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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.