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Finding the Fourth Proportional to 18.02, 26.87 and 15.75

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Solution

The fourth proportional to 18.02, 26.87 and 15.75 is: 23.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.02 : 26.87 = 15.75 : x
  2. Step 2: Convert to fraction form
    18.02/26.87 = 15.75/x
  3. Step 3: Cross multiply
    18.02x = 26.87 × 15.75
  4. Step 4: Simplify right side
    18.02x = 423.07
  5. Step 5: Solve for x
    x = 423.07/18.02
  6. Step 6: Final answer
    x = 23.48

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.