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Finding the Fourth Proportional to 105.95, 159.55 and 77.27

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Solution

The fourth proportional to 105.95, 159.55 and 77.27 is: 116.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.95 : 159.55 = 77.27 : x
  2. Step 2: Convert to fraction form
    105.95/159.55 = 77.27/x
  3. Step 3: Cross multiply
    105.95x = 159.55 × 77.27
  4. Step 4: Simplify right side
    105.95x = 12,327.44
  5. Step 5: Solve for x
    x = 12,327.44/105.95
  6. Step 6: Final answer
    x = 116.35

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.