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Finding the Fourth Proportional to 109.07, 150.42 and 72.20

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Solution

The fourth proportional to 109.07, 150.42 and 72.20 is: 99.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.07 : 150.42 = 72.20 : x
  2. Step 2: Convert to fraction form
    109.07/150.42 = 72.20/x
  3. Step 3: Cross multiply
    109.07x = 150.42 × 72.20
  4. Step 4: Simplify right side
    109.07x = 10,859.57
  5. Step 5: Solve for x
    x = 10,859.57/109.07
  6. Step 6: Final answer
    x = 99.57

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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.