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Finding the Fourth Proportional to 39.36, 58.65 and 38.56

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Solution

The fourth proportional to 39.36, 58.65 and 38.56 is: 57.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.36 : 58.65 = 38.56 : x
  2. Step 2: Convert to fraction form
    39.36/58.65 = 38.56/x
  3. Step 3: Cross multiply
    39.36x = 58.65 × 38.56
  4. Step 4: Simplify right side
    39.36x = 2,261.54
  5. Step 5: Solve for x
    x = 2,261.54/39.36
  6. Step 6: Final answer
    x = 57.46

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.