Home / 122,972.78-169,780.80-100,365.71

Finding the Fourth Proportional to 122,972.78, 169,780.80 and 100,365.71

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Solution

The fourth proportional to 122,972.78, 169,780.80 and 100,365.71 is: 138,568.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,972.78 : 169,780.80 = 100,365.71 : x
  2. Step 2: Convert to fraction form
    122,972.78/169,780.80 = 100,365.71/x
  3. Step 3: Cross multiply
    122,972.78x = 169,780.80 × 100,365.71
  4. Step 4: Simplify right side
    122,972.78x = 17,040,169,687.46
  5. Step 5: Solve for x
    x = 17,040,169,687.46/122,972.78
  6. Step 6: Final answer
    x = 138,568.64

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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.