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Finding the Fourth Proportional to 108.69, 150 and 69.35

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Solution

The fourth proportional to 108.69, 150 and 69.35 is: 95.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.69 : 150 = 69.35 : x
  2. Step 2: Convert to fraction form
    108.69/150 = 69.35/x
  3. Step 3: Cross multiply
    108.69x = 150 × 69.35
  4. Step 4: Simplify right side
    108.69x = 10,401.75
  5. Step 5: Solve for x
    x = 10,401.75/108.69
  6. Step 6: Final answer
    x = 95.70

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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.