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Finding the Fourth Proportional to 78.26, 107.98 and 43.76

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Solution

The fourth proportional to 78.26, 107.98 and 43.76 is: 60.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.26 : 107.98 = 43.76 : x
  2. Step 2: Convert to fraction form
    78.26/107.98 = 43.76/x
  3. Step 3: Cross multiply
    78.26x = 107.98 × 43.76
  4. Step 4: Simplify right side
    78.26x = 4,725.20
  5. Step 5: Solve for x
    x = 4,725.20/78.26
  6. Step 6: Final answer
    x = 60.38

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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.