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Finding the Fourth Proportional to 143.78, 214.75 and 103.17

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Solution

The fourth proportional to 143.78, 214.75 and 103.17 is: 154.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.78 : 214.75 = 103.17 : x
  2. Step 2: Convert to fraction form
    143.78/214.75 = 103.17/x
  3. Step 3: Cross multiply
    143.78x = 214.75 × 103.17
  4. Step 4: Simplify right side
    143.78x = 22,156.69
  5. Step 5: Solve for x
    x = 22,156.69/143.78
  6. Step 6: Final answer
    x = 154.11

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.