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Finding the Fourth Proportional to 47.57, 71.45 and 45.23

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Solution

The fourth proportional to 47.57, 71.45 and 45.23 is: 67.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.57 : 71.45 = 45.23 : x
  2. Step 2: Convert to fraction form
    47.57/71.45 = 45.23/x
  3. Step 3: Cross multiply
    47.57x = 71.45 × 45.23
  4. Step 4: Simplify right side
    47.57x = 3,231.68
  5. Step 5: Solve for x
    x = 3,231.68/47.57
  6. Step 6: Final answer
    x = 67.94

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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.