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Finding the Fourth Proportional to 143.22, 214.89 and 74.79

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Solution

The fourth proportional to 143.22, 214.89 and 74.79 is: 112.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.22 : 214.89 = 74.79 : x
  2. Step 2: Convert to fraction form
    143.22/214.89 = 74.79/x
  3. Step 3: Cross multiply
    143.22x = 214.89 × 74.79
  4. Step 4: Simplify right side
    143.22x = 16,071.34
  5. Step 5: Solve for x
    x = 16,071.34/143.22
  6. Step 6: Final answer
    x = 112.22

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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.