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Finding the Fourth Proportional to 38.48, 57.45 and 34.64

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Solution

The fourth proportional to 38.48, 57.45 and 34.64 is: 51.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.48 : 57.45 = 34.64 : x
  2. Step 2: Convert to fraction form
    38.48/57.45 = 34.64/x
  3. Step 3: Cross multiply
    38.48x = 57.45 × 34.64
  4. Step 4: Simplify right side
    38.48x = 1,989.61
  5. Step 5: Solve for x
    x = 1,989.61/38.48
  6. Step 6: Final answer
    x = 51.70

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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.