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Finding the Fourth Proportional to 115.55, 159.46 and 65.77

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Solution

The fourth proportional to 115.55, 159.46 and 65.77 is: 90.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.55 : 159.46 = 65.77 : x
  2. Step 2: Convert to fraction form
    115.55/159.46 = 65.77/x
  3. Step 3: Cross multiply
    115.55x = 159.46 × 65.77
  4. Step 4: Simplify right side
    115.55x = 10,487.31
  5. Step 5: Solve for x
    x = 10,487.31/115.55
  6. Step 6: Final answer
    x = 90.76

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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.