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Finding the Fourth Proportional to 162.20, 243.32 and 79.98

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Solution

The fourth proportional to 162.20, 243.32 and 79.98 is: 119.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    162.20 : 243.32 = 79.98 : x
  2. Step 2: Convert to fraction form
    162.20/243.32 = 79.98/x
  3. Step 3: Cross multiply
    162.20x = 243.32 × 79.98
  4. Step 4: Simplify right side
    162.20x = 19,460.74
  5. Step 5: Solve for x
    x = 19,460.74/162.20
  6. Step 6: Final answer
    x = 119.98

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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.