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Finding the Fourth Proportional to 18.47, 25.46 and 15.72

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Solution

The fourth proportional to 18.47, 25.46 and 15.72 is: 21.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.47 : 25.46 = 15.72 : x
  2. Step 2: Convert to fraction form
    18.47/25.46 = 15.72/x
  3. Step 3: Cross multiply
    18.47x = 25.46 × 15.72
  4. Step 4: Simplify right side
    18.47x = 400.15
  5. Step 5: Solve for x
    x = 400.15/18.47
  6. Step 6: Final answer
    x = 21.67

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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.