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Finding the Fourth Proportional to 47.65, 71.44 and 17.20

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Solution

The fourth proportional to 47.65, 71.44 and 17.20 is: 25.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.65 : 71.44 = 17.20 : x
  2. Step 2: Convert to fraction form
    47.65/71.44 = 17.20/x
  3. Step 3: Cross multiply
    47.65x = 71.44 × 17.20
  4. Step 4: Simplify right side
    47.65x = 1,228.53
  5. Step 5: Solve for x
    x = 1,228.53/47.65
  6. Step 6: Final answer
    x = 25.78

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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.