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Finding the Fourth Proportional to 84,617,879.20, 126,926,818.80 and 20,792,471.20

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Solution

The fourth proportional to 84,617,879.20, 126,926,818.80 and 20,792,471.20 is: 31,188,706.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,617,879.20 : 126,926,818.80 = 20,792,471.20 : x
  2. Step 2: Convert to fraction form
    84,617,879.20/126,926,818.80 = 20,792,471.20/x
  3. Step 3: Cross multiply
    84,617,879.20x = 126,926,818.80 × 20,792,471.20
  4. Step 4: Simplify right side
    84,617,879.20x = 2,639,122,224,406,618.50
  5. Step 5: Solve for x
    x = 2,639,122,224,406,618.50/84,617,879.20
  6. Step 6: Final answer
    x = 31,188,706.80

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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.