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Finding the Fourth Proportional to 74.78, 103.14 and 55.11

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Solution

The fourth proportional to 74.78, 103.14 and 55.11 is: 76.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.78 : 103.14 = 55.11 : x
  2. Step 2: Convert to fraction form
    74.78/103.14 = 55.11/x
  3. Step 3: Cross multiply
    74.78x = 103.14 × 55.11
  4. Step 4: Simplify right side
    74.78x = 5,684.05
  5. Step 5: Solve for x
    x = 5,684.05/74.78
  6. Step 6: Final answer
    x = 76.02

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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.