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Finding the Fourth Proportional to 121,414.40, 181,927.20 and 79,812.80

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Solution

The fourth proportional to 121,414.40, 181,927.20 and 79,812.80 is: 119,591.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,414.40 : 181,927.20 = 79,812.80 : x
  2. Step 2: Convert to fraction form
    121,414.40/181,927.20 = 79,812.80/x
  3. Step 3: Cross multiply
    121,414.40x = 181,927.20 × 79,812.80
  4. Step 4: Simplify right side
    121,414.40x = 14,520,119,228.16
  5. Step 5: Solve for x
    x = 14,520,119,228.16/121,414.40
  6. Step 6: Final answer
    x = 119,591.41

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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.