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Finding the Fourth Proportional to 79,705.71, 119,565.90 and 20,541.60

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Solution

The fourth proportional to 79,705.71, 119,565.90 and 20,541.60 is: 30,814.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,705.71 : 119,565.90 = 20,541.60 : x
  2. Step 2: Convert to fraction form
    79,705.71/119,565.90 = 20,541.60/x
  3. Step 3: Cross multiply
    79,705.71x = 119,565.90 × 20,541.60
  4. Step 4: Simplify right side
    79,705.71x = 2,456,074,891.44
  5. Step 5: Solve for x
    x = 2,456,074,891.44/79,705.71
  6. Step 6: Final answer
    x = 30,814.29

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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.