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Finding the Fourth Proportional to 78,329.97, 108,012.69 and 55,645.38

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Solution

The fourth proportional to 78,329.97, 108,012.69 and 55,645.38 is: 76,731.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,329.97 : 108,012.69 = 55,645.38 : x
  2. Step 2: Convert to fraction form
    78,329.97/108,012.69 = 55,645.38/x
  3. Step 3: Cross multiply
    78,329.97x = 108,012.69 × 55,645.38
  4. Step 4: Simplify right side
    78,329.97x = 6,010,407,179.87
  5. Step 5: Solve for x
    x = 6,010,407,179.87/78,329.97
  6. Step 6: Final answer
    x = 76,731.90

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1.5x scale

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.