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Finding the Fourth Proportional to 48.78, 72.72 and 46.08

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Solution

The fourth proportional to 48.78, 72.72 and 46.08 is: 68.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.78 : 72.72 = 46.08 : x
  2. Step 2: Convert to fraction form
    48.78/72.72 = 46.08/x
  3. Step 3: Cross multiply
    48.78x = 72.72 × 46.08
  4. Step 4: Simplify right side
    48.78x = 3,350.94
  5. Step 5: Solve for x
    x = 3,350.94/48.78
  6. Step 6: Final answer
    x = 68.69

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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.