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Finding the Fourth Proportional to 100.99, 139.24 and 65.96

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Solution

The fourth proportional to 100.99, 139.24 and 65.96 is: 90.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.99 : 139.24 = 65.96 : x
  2. Step 2: Convert to fraction form
    100.99/139.24 = 65.96/x
  3. Step 3: Cross multiply
    100.99x = 139.24 × 65.96
  4. Step 4: Simplify right side
    100.99x = 9,183.94
  5. Step 5: Solve for x
    x = 9,183.94/100.99
  6. Step 6: Final answer
    x = 90.94

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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.