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Finding the Fourth Proportional to 94.90, 142.41 and 40.78

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Solution

The fourth proportional to 94.90, 142.41 and 40.78 is: 61.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.90 : 142.41 = 40.78 : x
  2. Step 2: Convert to fraction form
    94.90/142.41 = 40.78/x
  3. Step 3: Cross multiply
    94.90x = 142.41 × 40.78
  4. Step 4: Simplify right side
    94.90x = 5,807.48
  5. Step 5: Solve for x
    x = 5,807.48/94.90
  6. Step 6: Final answer
    x = 61.20

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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.