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Finding the Fourth Proportional to 120,825.80, 181,238.70 and 89,721.80

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Solution

The fourth proportional to 120,825.80, 181,238.70 and 89,721.80 is: 134,582.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,825.80 : 181,238.70 = 89,721.80 : x
  2. Step 2: Convert to fraction form
    120,825.80/181,238.70 = 89,721.80/x
  3. Step 3: Cross multiply
    120,825.80x = 181,238.70 × 89,721.80
  4. Step 4: Simplify right side
    120,825.80x = 16,261,062,393.66
  5. Step 5: Solve for x
    x = 16,261,062,393.66/120,825.80
  6. Step 6: Final answer
    x = 134,582.70

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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.