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Finding the Fourth Proportional to 49.40, 68.24 and 47.60

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Solution

The fourth proportional to 49.40, 68.24 and 47.60 is: 65.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.40 : 68.24 = 47.60 : x
  2. Step 2: Convert to fraction form
    49.40/68.24 = 47.60/x
  3. Step 3: Cross multiply
    49.40x = 68.24 × 47.60
  4. Step 4: Simplify right side
    49.40x = 3,248.22
  5. Step 5: Solve for x
    x = 3,248.22/49.40
  6. Step 6: Final answer
    x = 65.75

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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.