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Finding the Fourth Proportional to 48.78, 73.02 and 31.68

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Solution

The fourth proportional to 48.78, 73.02 and 31.68 is: 47.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.78 : 73.02 = 31.68 : x
  2. Step 2: Convert to fraction form
    48.78/73.02 = 31.68/x
  3. Step 3: Cross multiply
    48.78x = 73.02 × 31.68
  4. Step 4: Simplify right side
    48.78x = 2,313.27
  5. Step 5: Solve for x
    x = 2,313.27/48.78
  6. Step 6: Final answer
    x = 47.42

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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.