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Finding the Fourth Proportional to 47.96, 66.16 and 28.56

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Solution

The fourth proportional to 47.96, 66.16 and 28.56 is: 39.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.96 : 66.16 = 28.56 : x
  2. Step 2: Convert to fraction form
    47.96/66.16 = 28.56/x
  3. Step 3: Cross multiply
    47.96x = 66.16 × 28.56
  4. Step 4: Simplify right side
    47.96x = 1,889.53
  5. Step 5: Solve for x
    x = 1,889.53/47.96
  6. Step 6: Final answer
    x = 39.40

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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.