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Finding the Fourth Proportional to 48.94, 67.51 and 28.21

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Solution

The fourth proportional to 48.94, 67.51 and 28.21 is: 38.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.94 : 67.51 = 28.21 : x
  2. Step 2: Convert to fraction form
    48.94/67.51 = 28.21/x
  3. Step 3: Cross multiply
    48.94x = 67.51 × 28.21
  4. Step 4: Simplify right side
    48.94x = 1,904.22
  5. Step 5: Solve for x
    x = 1,904.22/48.94
  6. Step 6: Final answer
    x = 38.91

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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.