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Finding the Fourth Proportional to 78.29, 108.50 and 75.46

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Solution

The fourth proportional to 78.29, 108.50 and 75.46 is: 104.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.29 : 108.50 = 75.46 : x
  2. Step 2: Convert to fraction form
    78.29/108.50 = 75.46/x
  3. Step 3: Cross multiply
    78.29x = 108.50 × 75.46
  4. Step 4: Simplify right side
    78.29x = 8,187.41
  5. Step 5: Solve for x
    x = 8,187.41/78.29
  6. Step 6: Final answer
    x = 104.58

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.