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Finding the Fourth Proportional to 47.55, 65.62 and 28.90

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Solution

The fourth proportional to 47.55, 65.62 and 28.90 is: 39.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.55 : 65.62 = 28.90 : x
  2. Step 2: Convert to fraction form
    47.55/65.62 = 28.90/x
  3. Step 3: Cross multiply
    47.55x = 65.62 × 28.90
  4. Step 4: Simplify right side
    47.55x = 1,896.39
  5. Step 5: Solve for x
    x = 1,896.39/47.55
  6. Step 6: Final answer
    x = 39.88

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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.