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Finding the Fourth Proportional to 162.30, 243.30 and 85.20

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Solution

The fourth proportional to 162.30, 243.30 and 85.20 is: 127.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    162.30 : 243.30 = 85.20 : x
  2. Step 2: Convert to fraction form
    162.30/243.30 = 85.20/x
  3. Step 3: Cross multiply
    162.30x = 243.30 × 85.20
  4. Step 4: Simplify right side
    162.30x = 20,729.94
  5. Step 5: Solve for x
    x = 20,729.94/162.30
  6. Step 6: Final answer
    x = 127.72

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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.