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Finding the Fourth Proportional to 48.74, 67.21 and 30.31

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Solution

The fourth proportional to 48.74, 67.21 and 30.31 is: 41.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.74 : 67.21 = 30.31 : x
  2. Step 2: Convert to fraction form
    48.74/67.21 = 30.31/x
  3. Step 3: Cross multiply
    48.74x = 67.21 × 30.31
  4. Step 4: Simplify right side
    48.74x = 2,036.89
  5. Step 5: Solve for x
    x = 2,036.89/48.74
  6. Step 6: Final answer
    x = 41.80

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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.