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Finding the Fourth Proportional to 121,153.80, 181,658.70 and 74,440.20

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Solution

The fourth proportional to 121,153.80, 181,658.70 and 74,440.20 is: 111,616.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,153.80 : 181,658.70 = 74,440.20 : x
  2. Step 2: Convert to fraction form
    121,153.80/181,658.70 = 74,440.20/x
  3. Step 3: Cross multiply
    121,153.80x = 181,658.70 × 74,440.20
  4. Step 4: Simplify right side
    121,153.80x = 13,522,709,959.74
  5. Step 5: Solve for x
    x = 13,522,709,959.74/121,153.80
  6. Step 6: Final answer
    x = 111,616.06

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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.