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Finding the Fourth Proportional to 6.21, 8.55 and 5.78

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Solution

The fourth proportional to 6.21, 8.55 and 5.78 is: 7.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    6.21 : 8.55 = 5.78 : x
  2. Step 2: Convert to fraction form
    6.21/8.55 = 5.78/x
  3. Step 3: Cross multiply
    6.21x = 8.55 × 5.78
  4. Step 4: Simplify right side
    6.21x = 49.39
  5. Step 5: Solve for x
    x = 49.39/6.21
  6. Step 6: Final answer
    x = 7.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.