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Finding the Fourth Proportional to 55.27, 76.30 and 42.96

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Solution

The fourth proportional to 55.27, 76.30 and 42.96 is: 59.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.27 : 76.30 = 42.96 : x
  2. Step 2: Convert to fraction form
    55.27/76.30 = 42.96/x
  3. Step 3: Cross multiply
    55.27x = 76.30 × 42.96
  4. Step 4: Simplify right side
    55.27x = 3,277.85
  5. Step 5: Solve for x
    x = 3,277.85/55.27
  6. Step 6: Final answer
    x = 59.31

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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.