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Finding the Fourth Proportional to 162.64, 243.51 and 128.20

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Solution

The fourth proportional to 162.64, 243.51 and 128.20 is: 191.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    162.64 : 243.51 = 128.20 : x
  2. Step 2: Convert to fraction form
    162.64/243.51 = 128.20/x
  3. Step 3: Cross multiply
    162.64x = 243.51 × 128.20
  4. Step 4: Simplify right side
    162.64x = 31,217.98
  5. Step 5: Solve for x
    x = 31,217.98/162.64
  6. Step 6: Final answer
    x = 191.95

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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.