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Finding the Fourth Proportional to 2.88, 4.32 and 1.38

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Solution

The fourth proportional to 2.88, 4.32 and 1.38 is: 2.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.88 : 4.32 = 1.38 : x
  2. Step 2: Convert to fraction form
    2.88/4.32 = 1.38/x
  3. Step 3: Cross multiply
    2.88x = 4.32 × 1.38
  4. Step 4: Simplify right side
    2.88x = 5.96
  5. Step 5: Solve for x
    x = 5.96/2.88
  6. Step 6: Final answer
    x = 2.07

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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.