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Finding the Fourth Proportional to 49.70, 74.58 and 38.31

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Solution

The fourth proportional to 49.70, 74.58 and 38.31 is: 57.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.70 : 74.58 = 38.31 : x
  2. Step 2: Convert to fraction form
    49.70/74.58 = 38.31/x
  3. Step 3: Cross multiply
    49.70x = 74.58 × 38.31
  4. Step 4: Simplify right side
    49.70x = 2,857.16
  5. Step 5: Solve for x
    x = 2,857.16/49.70
  6. Step 6: Final answer
    x = 57.49

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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.