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Finding the Fourth Proportional to 109.99, 151.72 and 73.11

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Solution

The fourth proportional to 109.99, 151.72 and 73.11 is: 100.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.99 : 151.72 = 73.11 : x
  2. Step 2: Convert to fraction form
    109.99/151.72 = 73.11/x
  3. Step 3: Cross multiply
    109.99x = 151.72 × 73.11
  4. Step 4: Simplify right side
    109.99x = 11,092.25
  5. Step 5: Solve for x
    x = 11,092.25/109.99
  6. Step 6: Final answer
    x = 100.85

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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.