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Finding the Fourth Proportional to 162.57, 243.62 and 81.47

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Solution

The fourth proportional to 162.57, 243.62 and 81.47 is: 122.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    162.57 : 243.62 = 81.47 : x
  2. Step 2: Convert to fraction form
    162.57/243.62 = 81.47/x
  3. Step 3: Cross multiply
    162.57x = 243.62 × 81.47
  4. Step 4: Simplify right side
    162.57x = 19,846.10
  5. Step 5: Solve for x
    x = 19,846.10/162.57
  6. Step 6: Final answer
    x = 122.08

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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.