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Finding the Fourth Proportional to 18.78, 28.50 and 18.60

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Solution

The fourth proportional to 18.78, 28.50 and 18.60 is: 28.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.78 : 28.50 = 18.60 : x
  2. Step 2: Convert to fraction form
    18.78/28.50 = 18.60/x
  3. Step 3: Cross multiply
    18.78x = 28.50 × 18.60
  4. Step 4: Simplify right side
    18.78x = 530.10
  5. Step 5: Solve for x
    x = 530.10/18.78
  6. Step 6: Final answer
    x = 28.23

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.