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Finding the Fourth Proportional to 48.02, 66.20 and 39.82

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Solution

The fourth proportional to 48.02, 66.20 and 39.82 is: 54.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.02 : 66.20 = 39.82 : x
  2. Step 2: Convert to fraction form
    48.02/66.20 = 39.82/x
  3. Step 3: Cross multiply
    48.02x = 66.20 × 39.82
  4. Step 4: Simplify right side
    48.02x = 2,636.08
  5. Step 5: Solve for x
    x = 2,636.08/48.02
  6. Step 6: Final answer
    x = 54.90

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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.