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Finding the Fourth Proportional to 28.86, 39.78 and 18.48

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Solution

The fourth proportional to 28.86, 39.78 and 18.48 is: 25.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.86 : 39.78 = 18.48 : x
  2. Step 2: Convert to fraction form
    28.86/39.78 = 18.48/x
  3. Step 3: Cross multiply
    28.86x = 39.78 × 18.48
  4. Step 4: Simplify right side
    28.86x = 735.13
  5. Step 5: Solve for x
    x = 735.13/28.86
  6. Step 6: Final answer
    x = 25.47

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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.