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Finding the Fourth Proportional to 3.57, 5.38 and 2.91

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Solution

The fourth proportional to 3.57, 5.38 and 2.91 is: 4.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.57 : 5.38 = 2.91 : x
  2. Step 2: Convert to fraction form
    3.57/5.38 = 2.91/x
  3. Step 3: Cross multiply
    3.57x = 5.38 × 2.91
  4. Step 4: Simplify right side
    3.57x = 15.63
  5. Step 5: Solve for x
    x = 15.63/3.57
  6. Step 6: Final answer
    x = 4.38

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.