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Finding the Fourth Proportional to 78.29, 108.05 and 45.55

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Solution

The fourth proportional to 78.29, 108.05 and 45.55 is: 62.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.29 : 108.05 = 45.55 : x
  2. Step 2: Convert to fraction form
    78.29/108.05 = 45.55/x
  3. Step 3: Cross multiply
    78.29x = 108.05 × 45.55
  4. Step 4: Simplify right side
    78.29x = 4,921.18
  5. Step 5: Solve for x
    x = 4,921.18/78.29
  6. Step 6: Final answer
    x = 62.86

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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.