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Finding the Fourth Proportional to 112,720.70, 169,006.02 and 67,640.56

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Solution

The fourth proportional to 112,720.70, 169,006.02 and 67,640.56 is: 101,415.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,720.70 : 169,006.02 = 67,640.56 : x
  2. Step 2: Convert to fraction form
    112,720.70/169,006.02 = 67,640.56/x
  3. Step 3: Cross multiply
    112,720.70x = 169,006.02 × 67,640.56
  4. Step 4: Simplify right side
    112,720.70x = 11,431,661,836.17
  5. Step 5: Solve for x
    x = 11,431,661,836.17/112,720.70
  6. Step 6: Final answer
    x = 101,415.82

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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.