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Finding the Fourth Proportional to 142.38, 212.79 and 103.94

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Solution

The fourth proportional to 142.38, 212.79 and 103.94 is: 155.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.38 : 212.79 = 103.94 : x
  2. Step 2: Convert to fraction form
    142.38/212.79 = 103.94/x
  3. Step 3: Cross multiply
    142.38x = 212.79 × 103.94
  4. Step 4: Simplify right side
    142.38x = 22,116.71
  5. Step 5: Solve for x
    x = 22,116.71/142.38
  6. Step 6: Final answer
    x = 155.34

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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.