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Finding the Fourth Proportional to 47.72, 71.59 and 17.29

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Solution

The fourth proportional to 47.72, 71.59 and 17.29 is: 25.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.72 : 71.59 = 17.29 : x
  2. Step 2: Convert to fraction form
    47.72/71.59 = 17.29/x
  3. Step 3: Cross multiply
    47.72x = 71.59 × 17.29
  4. Step 4: Simplify right side
    47.72x = 1,237.43
  5. Step 5: Solve for x
    x = 1,237.43/47.72
  6. Step 6: Final answer
    x = 25.93

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.