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Finding the Fourth Proportional to 121,169.60, 181,732.80 and 76,716.80

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Solution

The fourth proportional to 121,169.60, 181,732.80 and 76,716.80 is: 115,061.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,169.60 : 181,732.80 = 76,716.80 : x
  2. Step 2: Convert to fraction form
    121,169.60/181,732.80 = 76,716.80/x
  3. Step 3: Cross multiply
    121,169.60x = 181,732.80 × 76,716.80
  4. Step 4: Simplify right side
    121,169.60x = 13,941,958,871.04
  5. Step 5: Solve for x
    x = 13,941,958,871.04/121,169.60
  6. Step 6: Final answer
    x = 115,061.52

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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.