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Finding the Fourth Proportional to 42.29, 63.44 and 13.40

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Solution

The fourth proportional to 42.29, 63.44 and 13.40 is: 20.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.29 : 63.44 = 13.40 : x
  2. Step 2: Convert to fraction form
    42.29/63.44 = 13.40/x
  3. Step 3: Cross multiply
    42.29x = 63.44 × 13.40
  4. Step 4: Simplify right side
    42.29x = 850.03
  5. Step 5: Solve for x
    x = 850.03/42.29
  6. Step 6: Final answer
    x = 20.10

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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.