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Finding the Fourth Proportional to 100,625.45, 138,716.79 and 70,316.71

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Solution

The fourth proportional to 100,625.45, 138,716.79 and 70,316.71 is: 96,934.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,625.45 : 138,716.79 = 70,316.71 : x
  2. Step 2: Convert to fraction form
    100,625.45/138,716.79 = 70,316.71/x
  3. Step 3: Cross multiply
    100,625.45x = 138,716.79 × 70,316.71
  4. Step 4: Simplify right side
    100,625.45x = 9,754,107,947.77
  5. Step 5: Solve for x
    x = 9,754,107,947.77/100,625.45
  6. Step 6: Final answer
    x = 96,934.80

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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.