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Finding the Fourth Proportional to 39.10, 58.71 and 38.18

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Solution

The fourth proportional to 39.10, 58.71 and 38.18 is: 57.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.10 : 58.71 = 38.18 : x
  2. Step 2: Convert to fraction form
    39.10/58.71 = 38.18/x
  3. Step 3: Cross multiply
    39.10x = 58.71 × 38.18
  4. Step 4: Simplify right side
    39.10x = 2,241.55
  5. Step 5: Solve for x
    x = 2,241.55/39.10
  6. Step 6: Final answer
    x = 57.34

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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.