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Finding the Fourth Proportional to 161.51, 242.08 and 74.79

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Solution

The fourth proportional to 161.51, 242.08 and 74.79 is: 112.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.51 : 242.08 = 74.79 : x
  2. Step 2: Convert to fraction form
    161.51/242.08 = 74.79/x
  3. Step 3: Cross multiply
    161.51x = 242.08 × 74.79
  4. Step 4: Simplify right side
    161.51x = 18,104.98
  5. Step 5: Solve for x
    x = 18,104.98/161.51
  6. Step 6: Final answer
    x = 112.10

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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.