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Finding the Fourth Proportional to 103.24, 142.34 and 78.63

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Solution

The fourth proportional to 103.24, 142.34 and 78.63 is: 108.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.24 : 142.34 = 78.63 : x
  2. Step 2: Convert to fraction form
    103.24/142.34 = 78.63/x
  3. Step 3: Cross multiply
    103.24x = 142.34 × 78.63
  4. Step 4: Simplify right side
    103.24x = 11,192.19
  5. Step 5: Solve for x
    x = 11,192.19/103.24
  6. Step 6: Final answer
    x = 108.41

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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.