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Finding the Fourth Proportional to 122,261.88, 168,721.84 and 71,309.78

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Solution

The fourth proportional to 122,261.88, 168,721.84 and 71,309.78 is: 98,407.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,261.88 : 168,721.84 = 71,309.78 : x
  2. Step 2: Convert to fraction form
    122,261.88/168,721.84 = 71,309.78/x
  3. Step 3: Cross multiply
    122,261.88x = 168,721.84 × 71,309.78
  4. Step 4: Simplify right side
    122,261.88x = 12,031,517,291.60
  5. Step 5: Solve for x
    x = 12,031,517,291.60/122,261.88
  6. Step 6: Final answer
    x = 98,407.76

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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.