Home / 78,996.40-108,942.78-61,771

Finding the Fourth Proportional to 78,996.40, 108,942.78 and 61,771

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Solution

The fourth proportional to 78,996.40, 108,942.78 and 61,771 is: 85,187.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,996.40 : 108,942.78 = 61,771 : x
  2. Step 2: Convert to fraction form
    78,996.40/108,942.78 = 61,771/x
  3. Step 3: Cross multiply
    78,996.40x = 108,942.78 × 61,771
  4. Step 4: Simplify right side
    78,996.40x = 6,729,504,463.38
  5. Step 5: Solve for x
    x = 6,729,504,463.38/78,996.40
  6. Step 6: Final answer
    x = 85,187.48

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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.