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Finding the Fourth Proportional to 42.04, 57.81 and 40.15

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Solution

The fourth proportional to 42.04, 57.81 and 40.15 is: 55.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.04 : 57.81 = 40.15 : x
  2. Step 2: Convert to fraction form
    42.04/57.81 = 40.15/x
  3. Step 3: Cross multiply
    42.04x = 57.81 × 40.15
  4. Step 4: Simplify right side
    42.04x = 2,321.07
  5. Step 5: Solve for x
    x = 2,321.07/42.04
  6. Step 6: Final answer
    x = 55.21

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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.