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Finding the Fourth Proportional to 162.80, 243.59 and 90.71

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Solution

The fourth proportional to 162.80, 243.59 and 90.71 is: 135.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    162.80 : 243.59 = 90.71 : x
  2. Step 2: Convert to fraction form
    162.80/243.59 = 90.71/x
  3. Step 3: Cross multiply
    162.80x = 243.59 × 90.71
  4. Step 4: Simplify right side
    162.80x = 22,096.05
  5. Step 5: Solve for x
    x = 22,096.05/162.80
  6. Step 6: Final answer
    x = 135.73

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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.