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Finding the Fourth Proportional to 4.12, 5.64 and 3.98

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Solution

The fourth proportional to 4.12, 5.64 and 3.98 is: 5.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.12 : 5.64 = 3.98 : x
  2. Step 2: Convert to fraction form
    4.12/5.64 = 3.98/x
  3. Step 3: Cross multiply
    4.12x = 5.64 × 3.98
  4. Step 4: Simplify right side
    4.12x = 22.45
  5. Step 5: Solve for x
    x = 22.45/4.12
  6. Step 6: Final answer
    x = 5.45

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.