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Finding the Fourth Proportional to 161.70, 242.09 and 100.64

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Solution

The fourth proportional to 161.70, 242.09 and 100.64 is: 150.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.70 : 242.09 = 100.64 : x
  2. Step 2: Convert to fraction form
    161.70/242.09 = 100.64/x
  3. Step 3: Cross multiply
    161.70x = 242.09 × 100.64
  4. Step 4: Simplify right side
    161.70x = 24,364.42
  5. Step 5: Solve for x
    x = 24,364.42/161.70
  6. Step 6: Final answer
    x = 150.68

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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.