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Finding the Fourth Proportional to 47.51, 71.28 and 20.48

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Solution

The fourth proportional to 47.51, 71.28 and 20.48 is: 30.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.51 : 71.28 = 20.48 : x
  2. Step 2: Convert to fraction form
    47.51/71.28 = 20.48/x
  3. Step 3: Cross multiply
    47.51x = 71.28 × 20.48
  4. Step 4: Simplify right side
    47.51x = 1,459.81
  5. Step 5: Solve for x
    x = 1,459.81/47.51
  6. Step 6: Final answer
    x = 30.73

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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.