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Finding the Fourth Proportional to 162.61, 243.71 and 81.41

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Solution

The fourth proportional to 162.61, 243.71 and 81.41 is: 122.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    162.61 : 243.71 = 81.41 : x
  2. Step 2: Convert to fraction form
    162.61/243.71 = 81.41/x
  3. Step 3: Cross multiply
    162.61x = 243.71 × 81.41
  4. Step 4: Simplify right side
    162.61x = 19,839.11
  5. Step 5: Solve for x
    x = 19,839.11/162.61
  6. Step 6: Final answer
    x = 122.01

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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.