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Finding the Fourth Proportional to 143.61, 215.32 and 81.81

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Solution

The fourth proportional to 143.61, 215.32 and 81.81 is: 122.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.61 : 215.32 = 81.81 : x
  2. Step 2: Convert to fraction form
    143.61/215.32 = 81.81/x
  3. Step 3: Cross multiply
    143.61x = 215.32 × 81.81
  4. Step 4: Simplify right side
    143.61x = 17,615.33
  5. Step 5: Solve for x
    x = 17,615.33/143.61
  6. Step 6: Final answer
    x = 122.66

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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.