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Finding the Fourth Proportional to 48.90, 67.38 and 45.60

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Solution

The fourth proportional to 48.90, 67.38 and 45.60 is: 62.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.90 : 67.38 = 45.60 : x
  2. Step 2: Convert to fraction form
    48.90/67.38 = 45.60/x
  3. Step 3: Cross multiply
    48.90x = 67.38 × 45.60
  4. Step 4: Simplify right side
    48.90x = 3,072.53
  5. Step 5: Solve for x
    x = 3,072.53/48.90
  6. Step 6: Final answer
    x = 62.83

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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.