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Finding the Fourth Proportional to 48.78, 72.81 and 42.06

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Solution

The fourth proportional to 48.78, 72.81 and 42.06 is: 62.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.78 : 72.81 = 42.06 : x
  2. Step 2: Convert to fraction form
    48.78/72.81 = 42.06/x
  3. Step 3: Cross multiply
    48.78x = 72.81 × 42.06
  4. Step 4: Simplify right side
    48.78x = 3,062.39
  5. Step 5: Solve for x
    x = 3,062.39/48.78
  6. Step 6: Final answer
    x = 62.78

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.