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Finding the Fourth Proportional to 109.21, 150.77 and 72.35

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Solution

The fourth proportional to 109.21, 150.77 and 72.35 is: 99.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.21 : 150.77 = 72.35 : x
  2. Step 2: Convert to fraction form
    109.21/150.77 = 72.35/x
  3. Step 3: Cross multiply
    109.21x = 150.77 × 72.35
  4. Step 4: Simplify right side
    109.21x = 10,907.85
  5. Step 5: Solve for x
    x = 10,907.85/109.21
  6. Step 6: Final answer
    x = 99.88

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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.