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Finding the Fourth Proportional to 47.90, 66.20 and 38.32

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Solution

The fourth proportional to 47.90, 66.20 and 38.32 is: 52.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.90 : 66.20 = 38.32 : x
  2. Step 2: Convert to fraction form
    47.90/66.20 = 38.32/x
  3. Step 3: Cross multiply
    47.90x = 66.20 × 38.32
  4. Step 4: Simplify right side
    47.90x = 2,536.43
  5. Step 5: Solve for x
    x = 2,536.43/47.90
  6. Step 6: Final answer
    x = 52.95

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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.