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Finding the Fourth Proportional to 3.78, 5.65 and 3.61

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Solution

The fourth proportional to 3.78, 5.65 and 3.61 is: 5.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.78 : 5.65 = 3.61 : x
  2. Step 2: Convert to fraction form
    3.78/5.65 = 3.61/x
  3. Step 3: Cross multiply
    3.78x = 5.65 × 3.61
  4. Step 4: Simplify right side
    3.78x = 20.40
  5. Step 5: Solve for x
    x = 20.40/3.78
  6. Step 6: Final answer
    x = 5.40

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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.