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Finding the Fourth Proportional to 4.91, 7.38 and 4.31

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Solution

The fourth proportional to 4.91, 7.38 and 4.31 is: 6.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.91 : 7.38 = 4.31 : x
  2. Step 2: Convert to fraction form
    4.91/7.38 = 4.31/x
  3. Step 3: Cross multiply
    4.91x = 7.38 × 4.31
  4. Step 4: Simplify right side
    4.91x = 31.81
  5. Step 5: Solve for x
    x = 31.81/4.91
  6. Step 6: Final answer
    x = 6.48

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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.