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Finding the Fourth Proportional to 78.29, 108.02 and 49.22

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Solution

The fourth proportional to 78.29, 108.02 and 49.22 is: 67.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.29 : 108.02 = 49.22 : x
  2. Step 2: Convert to fraction form
    78.29/108.02 = 49.22/x
  3. Step 3: Cross multiply
    78.29x = 108.02 × 49.22
  4. Step 4: Simplify right side
    78.29x = 5,316.33
  5. Step 5: Solve for x
    x = 5,316.33/78.29
  6. Step 6: Final answer
    x = 67.91

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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.