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Finding the Fourth Proportional to 18.64, 25.78 and 15.62

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Solution

The fourth proportional to 18.64, 25.78 and 15.62 is: 21.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.64 : 25.78 = 15.62 : x
  2. Step 2: Convert to fraction form
    18.64/25.78 = 15.62/x
  3. Step 3: Cross multiply
    18.64x = 25.78 × 15.62
  4. Step 4: Simplify right side
    18.64x = 402.68
  5. Step 5: Solve for x
    x = 402.68/18.64
  6. Step 6: Final answer
    x = 21.60

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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.