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Finding the Fourth Proportional to 68.72, 103.14 and 60.21

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Solution

The fourth proportional to 68.72, 103.14 and 60.21 is: 90.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.72 : 103.14 = 60.21 : x
  2. Step 2: Convert to fraction form
    68.72/103.14 = 60.21/x
  3. Step 3: Cross multiply
    68.72x = 103.14 × 60.21
  4. Step 4: Simplify right side
    68.72x = 6,210.06
  5. Step 5: Solve for x
    x = 6,210.06/68.72
  6. Step 6: Final answer
    x = 90.37

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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.