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Finding the Fourth Proportional to 81,074.62, 121,079.64 and 69,100.80

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Solution

The fourth proportional to 81,074.62, 121,079.64 and 69,100.80 is: 103,197.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,074.62 : 121,079.64 = 69,100.80 : x
  2. Step 2: Convert to fraction form
    81,074.62/121,079.64 = 69,100.80/x
  3. Step 3: Cross multiply
    81,074.62x = 121,079.64 × 69,100.80
  4. Step 4: Simplify right side
    81,074.62x = 8,366,699,792.79
  5. Step 5: Solve for x
    x = 8,366,699,792.79/81,074.62
  6. Step 6: Final answer
    x = 103,197.52

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.