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Finding the Fourth Proportional to 18.66, 25.76 and 11.40

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Solution

The fourth proportional to 18.66, 25.76 and 11.40 is: 15.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.66 : 25.76 = 11.40 : x
  2. Step 2: Convert to fraction form
    18.66/25.76 = 11.40/x
  3. Step 3: Cross multiply
    18.66x = 25.76 × 11.40
  4. Step 4: Simplify right side
    18.66x = 293.66
  5. Step 5: Solve for x
    x = 293.66/18.66
  6. Step 6: Final answer
    x = 15.74

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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.