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Finding the Fourth Proportional to 68.81, 103.30 and 56.12

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Solution

The fourth proportional to 68.81, 103.30 and 56.12 is: 84.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.81 : 103.30 = 56.12 : x
  2. Step 2: Convert to fraction form
    68.81/103.30 = 56.12/x
  3. Step 3: Cross multiply
    68.81x = 103.30 × 56.12
  4. Step 4: Simplify right side
    68.81x = 5,797.31
  5. Step 5: Solve for x
    x = 5,797.31/68.81
  6. Step 6: Final answer
    x = 84.26

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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.