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Finding the Fourth Proportional to 153.69, 230.76 and 72.69

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Solution

The fourth proportional to 153.69, 230.76 and 72.69 is: 109.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.69 : 230.76 = 72.69 : x
  2. Step 2: Convert to fraction form
    153.69/230.76 = 72.69/x
  3. Step 3: Cross multiply
    153.69x = 230.76 × 72.69
  4. Step 4: Simplify right side
    153.69x = 16,773.94
  5. Step 5: Solve for x
    x = 16,773.94/153.69
  6. Step 6: Final answer
    x = 109.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.