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Finding the Fourth Proportional to 162.16, 242.91 and 79.76

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Solution

The fourth proportional to 162.16, 242.91 and 79.76 is: 119.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    162.16 : 242.91 = 79.76 : x
  2. Step 2: Convert to fraction form
    162.16/242.91 = 79.76/x
  3. Step 3: Cross multiply
    162.16x = 242.91 × 79.76
  4. Step 4: Simplify right side
    162.16x = 19,375.11
  5. Step 5: Solve for x
    x = 19,375.11/162.16
  6. Step 6: Final answer
    x = 119.48

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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.