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Finding the Fourth Proportional to 121,315.60, 181,930.20 and 54,787.60

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Solution

The fourth proportional to 121,315.60, 181,930.20 and 54,787.60 is: 82,161.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,315.60 : 181,930.20 = 54,787.60 : x
  2. Step 2: Convert to fraction form
    121,315.60/181,930.20 = 54,787.60/x
  3. Step 3: Cross multiply
    121,315.60x = 181,930.20 × 54,787.60
  4. Step 4: Simplify right side
    121,315.60x = 9,967,519,025.52
  5. Step 5: Solve for x
    x = 9,967,519,025.52/121,315.60
  6. Step 6: Final answer
    x = 82,161.89

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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.