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Finding the Fourth Proportional to 122,679.77, 183,964.97 and 85,478.90

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Solution

The fourth proportional to 122,679.77, 183,964.97 and 85,478.90 is: 128,180.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,679.77 : 183,964.97 = 85,478.90 : x
  2. Step 2: Convert to fraction form
    122,679.77/183,964.97 = 85,478.90/x
  3. Step 3: Cross multiply
    122,679.77x = 183,964.97 × 85,478.90
  4. Step 4: Simplify right side
    122,679.77x = 15,725,122,568.01
  5. Step 5: Solve for x
    x = 15,725,122,568.01/122,679.77
  6. Step 6: Final answer
    x = 128,180.25

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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.