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Finding the Fourth Proportional to 47.58, 65.72 and 38.85

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Solution

The fourth proportional to 47.58, 65.72 and 38.85 is: 53.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.58 : 65.72 = 38.85 : x
  2. Step 2: Convert to fraction form
    47.58/65.72 = 38.85/x
  3. Step 3: Cross multiply
    47.58x = 65.72 × 38.85
  4. Step 4: Simplify right side
    47.58x = 2,553.22
  5. Step 5: Solve for x
    x = 2,553.22/47.58
  6. Step 6: Final answer
    x = 53.66

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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.