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Finding the Fourth Proportional to 111,661.84, 154,077.80 and 81,481.24

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Solution

The fourth proportional to 111,661.84, 154,077.80 and 81,481.24 is: 112,432.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,661.84 : 154,077.80 = 81,481.24 : x
  2. Step 2: Convert to fraction form
    111,661.84/154,077.80 = 81,481.24/x
  3. Step 3: Cross multiply
    111,661.84x = 154,077.80 × 81,481.24
  4. Step 4: Simplify right side
    111,661.84x = 12,554,449,985.66
  5. Step 5: Solve for x
    x = 12,554,449,985.66/111,661.84
  6. Step 6: Final answer
    x = 112,432.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.