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Finding the Fourth Proportional to 55.38, 76.38 and 51.78

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Solution

The fourth proportional to 55.38, 76.38 and 51.78 is: 71.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.38 : 76.38 = 51.78 : x
  2. Step 2: Convert to fraction form
    55.38/76.38 = 51.78/x
  3. Step 3: Cross multiply
    55.38x = 76.38 × 51.78
  4. Step 4: Simplify right side
    55.38x = 3,954.96
  5. Step 5: Solve for x
    x = 3,954.96/55.38
  6. Step 6: Final answer
    x = 71.41

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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.