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Finding the Fourth Proportional to 48.02, 66.30 and 38.85

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Solution

The fourth proportional to 48.02, 66.30 and 38.85 is: 53.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.02 : 66.30 = 38.85 : x
  2. Step 2: Convert to fraction form
    48.02/66.30 = 38.85/x
  3. Step 3: Cross multiply
    48.02x = 66.30 × 38.85
  4. Step 4: Simplify right side
    48.02x = 2,575.76
  5. Step 5: Solve for x
    x = 2,575.76/48.02
  6. Step 6: Final answer
    x = 53.64

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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.