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Finding the Fourth Proportional to 5.57, 8.31 and 5.51

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Solution

The fourth proportional to 5.57, 8.31 and 5.51 is: 8.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.57 : 8.31 = 5.51 : x
  2. Step 2: Convert to fraction form
    5.57/8.31 = 5.51/x
  3. Step 3: Cross multiply
    5.57x = 8.31 × 5.51
  4. Step 4: Simplify right side
    5.57x = 45.79
  5. Step 5: Solve for x
    x = 45.79/5.57
  6. Step 6: Final answer
    x = 8.22

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.