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Finding the Fourth Proportional to 162.32, 243.68 and 138.40

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Solution

The fourth proportional to 162.32, 243.68 and 138.40 is: 207.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    162.32 : 243.68 = 138.40 : x
  2. Step 2: Convert to fraction form
    162.32/243.68 = 138.40/x
  3. Step 3: Cross multiply
    162.32x = 243.68 × 138.40
  4. Step 4: Simplify right side
    162.32x = 33,725.31
  5. Step 5: Solve for x
    x = 33,725.31/162.32
  6. Step 6: Final answer
    x = 207.77

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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.