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Finding the Fourth Proportional to 109.58, 151.09 and 72.68

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Solution

The fourth proportional to 109.58, 151.09 and 72.68 is: 100.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.58 : 151.09 = 72.68 : x
  2. Step 2: Convert to fraction form
    109.58/151.09 = 72.68/x
  3. Step 3: Cross multiply
    109.58x = 151.09 × 72.68
  4. Step 4: Simplify right side
    109.58x = 10,981.22
  5. Step 5: Solve for x
    x = 10,981.22/109.58
  6. Step 6: Final answer
    x = 100.21

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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.