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Finding the Fourth Proportional to 49.50, 68.20 and 38.58

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Solution

The fourth proportional to 49.50, 68.20 and 38.58 is: 53.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.50 : 68.20 = 38.58 : x
  2. Step 2: Convert to fraction form
    49.50/68.20 = 38.58/x
  3. Step 3: Cross multiply
    49.50x = 68.20 × 38.58
  4. Step 4: Simplify right side
    49.50x = 2,631.16
  5. Step 5: Solve for x
    x = 2,631.16/49.50
  6. Step 6: Final answer
    x = 53.15

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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.