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Finding the Fourth Proportional to 5.56, 8.38 and 5.12

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Solution

The fourth proportional to 5.56, 8.38 and 5.12 is: 7.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.56 : 8.38 = 5.12 : x
  2. Step 2: Convert to fraction form
    5.56/8.38 = 5.12/x
  3. Step 3: Cross multiply
    5.56x = 8.38 × 5.12
  4. Step 4: Simplify right side
    5.56x = 42.91
  5. Step 5: Solve for x
    x = 42.91/5.56
  6. Step 6: Final answer
    x = 7.72

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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.