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Finding the Fourth Proportional to 162.40, 223.95 and 121.05

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Solution

The fourth proportional to 162.40, 223.95 and 121.05 is: 166.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    162.40 : 223.95 = 121.05 : x
  2. Step 2: Convert to fraction form
    162.40/223.95 = 121.05/x
  3. Step 3: Cross multiply
    162.40x = 223.95 × 121.05
  4. Step 4: Simplify right side
    162.40x = 27,109.15
  5. Step 5: Solve for x
    x = 27,109.15/162.40
  6. Step 6: Final answer
    x = 166.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.