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Finding the Fourth Proportional to 49.47, 68.07 and 47.91

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Solution

The fourth proportional to 49.47, 68.07 and 47.91 is: 65.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.47 : 68.07 = 47.91 : x
  2. Step 2: Convert to fraction form
    49.47/68.07 = 47.91/x
  3. Step 3: Cross multiply
    49.47x = 68.07 × 47.91
  4. Step 4: Simplify right side
    49.47x = 3,261.23
  5. Step 5: Solve for x
    x = 3,261.23/49.47
  6. Step 6: Final answer
    x = 65.92

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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.