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Finding the Fourth Proportional to 27.02, 40.48 and 19.78

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Solution

The fourth proportional to 27.02, 40.48 and 19.78 is: 29.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    27.02 : 40.48 = 19.78 : x
  2. Step 2: Convert to fraction form
    27.02/40.48 = 19.78/x
  3. Step 3: Cross multiply
    27.02x = 40.48 × 19.78
  4. Step 4: Simplify right side
    27.02x = 800.69
  5. Step 5: Solve for x
    x = 800.69/27.02
  6. Step 6: Final answer
    x = 29.63

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.