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Finding the Fourth Proportional to 103.29, 142.73 and 78.93

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Solution

The fourth proportional to 103.29, 142.73 and 78.93 is: 109.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.29 : 142.73 = 78.93 : x
  2. Step 2: Convert to fraction form
    103.29/142.73 = 78.93/x
  3. Step 3: Cross multiply
    103.29x = 142.73 × 78.93
  4. Step 4: Simplify right side
    103.29x = 11,265.28
  5. Step 5: Solve for x
    x = 11,265.28/103.29
  6. Step 6: Final answer
    x = 109.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.