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Finding the Fourth Proportional to 76.47, 105.48 and 48.79

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Solution

The fourth proportional to 76.47, 105.48 and 48.79 is: 67.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.47 : 105.48 = 48.79 : x
  2. Step 2: Convert to fraction form
    76.47/105.48 = 48.79/x
  3. Step 3: Cross multiply
    76.47x = 105.48 × 48.79
  4. Step 4: Simplify right side
    76.47x = 5,146.37
  5. Step 5: Solve for x
    x = 5,146.37/76.47
  6. Step 6: Final answer
    x = 67.30

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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.