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Finding the Fourth Proportional to 48.78, 72.99 and 43.38

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Solution

The fourth proportional to 48.78, 72.99 and 43.38 is: 64.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.78 : 72.99 = 43.38 : x
  2. Step 2: Convert to fraction form
    48.78/72.99 = 43.38/x
  3. Step 3: Cross multiply
    48.78x = 72.99 × 43.38
  4. Step 4: Simplify right side
    48.78x = 3,166.31
  5. Step 5: Solve for x
    x = 3,166.31/48.78
  6. Step 6: Final answer
    x = 64.91

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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.