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Finding the Fourth Proportional to 40.78, 61.12 and 17.94

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Solution

The fourth proportional to 40.78, 61.12 and 17.94 is: 26.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.78 : 61.12 = 17.94 : x
  2. Step 2: Convert to fraction form
    40.78/61.12 = 17.94/x
  3. Step 3: Cross multiply
    40.78x = 61.12 × 17.94
  4. Step 4: Simplify right side
    40.78x = 1,096.52
  5. Step 5: Solve for x
    x = 1,096.52/40.78
  6. Step 6: Final answer
    x = 26.89

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.