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Finding the Fourth Proportional to 161.97, 242.78 and 70.64

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Solution

The fourth proportional to 161.97, 242.78 and 70.64 is: 105.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.97 : 242.78 = 70.64 : x
  2. Step 2: Convert to fraction form
    161.97/242.78 = 70.64/x
  3. Step 3: Cross multiply
    161.97x = 242.78 × 70.64
  4. Step 4: Simplify right side
    161.97x = 17,150.76
  5. Step 5: Solve for x
    x = 17,150.76/161.97
  6. Step 6: Final answer
    x = 105.89

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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.