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Finding the Fourth Proportional to 4.78, 7.18 and 2.11

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Solution

The fourth proportional to 4.78, 7.18 and 2.11 is: 3.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.78 : 7.18 = 2.11 : x
  2. Step 2: Convert to fraction form
    4.78/7.18 = 2.11/x
  3. Step 3: Cross multiply
    4.78x = 7.18 × 2.11
  4. Step 4: Simplify right side
    4.78x = 15.14
  5. Step 5: Solve for x
    x = 15.14/4.78
  6. Step 6: Final answer
    x = 3.17

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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.