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Finding the Fourth Proportional to 47.88, 66.08 and 28.47

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Solution

The fourth proportional to 47.88, 66.08 and 28.47 is: 39.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.88 : 66.08 = 28.47 : x
  2. Step 2: Convert to fraction form
    47.88/66.08 = 28.47/x
  3. Step 3: Cross multiply
    47.88x = 66.08 × 28.47
  4. Step 4: Simplify right side
    47.88x = 1,881.30
  5. Step 5: Solve for x
    x = 1,881.30/47.88
  6. Step 6: Final answer
    x = 39.29

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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.