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Finding the Fourth Proportional to 161.70, 242.55 and 100.68

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Solution

The fourth proportional to 161.70, 242.55 and 100.68 is: 151.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.70 : 242.55 = 100.68 : x
  2. Step 2: Convert to fraction form
    161.70/242.55 = 100.68/x
  3. Step 3: Cross multiply
    161.70x = 242.55 × 100.68
  4. Step 4: Simplify right side
    161.70x = 24,419.93
  5. Step 5: Solve for x
    x = 24,419.93/161.70
  6. Step 6: Final answer
    x = 151.02

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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.