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Finding the Fourth Proportional to 18.96, 28.58 and 18.40

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Solution

The fourth proportional to 18.96, 28.58 and 18.40 is: 27.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.96 : 28.58 = 18.40 : x
  2. Step 2: Convert to fraction form
    18.96/28.58 = 18.40/x
  3. Step 3: Cross multiply
    18.96x = 28.58 × 18.40
  4. Step 4: Simplify right side
    18.96x = 525.87
  5. Step 5: Solve for x
    x = 525.87/18.96
  6. Step 6: Final answer
    x = 27.74

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.