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Finding the Fourth Proportional to 2.18, 2.97 and 2.15

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Solution

The fourth proportional to 2.18, 2.97 and 2.15 is: 2.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.18 : 2.97 = 2.15 : x
  2. Step 2: Convert to fraction form
    2.18/2.97 = 2.15/x
  3. Step 3: Cross multiply
    2.18x = 2.97 × 2.15
  4. Step 4: Simplify right side
    2.18x = 6.39
  5. Step 5: Solve for x
    x = 6.39/2.18
  6. Step 6: Final answer
    x = 2.93

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.