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Finding the Fourth Proportional to 4.78, 7.14 and 3.78

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Solution

The fourth proportional to 4.78, 7.14 and 3.78 is: 5.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.78 : 7.14 = 3.78 : x
  2. Step 2: Convert to fraction form
    4.78/7.14 = 3.78/x
  3. Step 3: Cross multiply
    4.78x = 7.14 × 3.78
  4. Step 4: Simplify right side
    4.78x = 26.99
  5. Step 5: Solve for x
    x = 26.99/4.78
  6. Step 6: Final answer
    x = 5.65

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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.