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Finding the Fourth Proportional to 103.88, 143.38 and 72.77

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Solution

The fourth proportional to 103.88, 143.38 and 72.77 is: 100.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.88 : 143.38 = 72.77 : x
  2. Step 2: Convert to fraction form
    103.88/143.38 = 72.77/x
  3. Step 3: Cross multiply
    103.88x = 143.38 × 72.77
  4. Step 4: Simplify right side
    103.88x = 10,432.68
  5. Step 5: Solve for x
    x = 10,432.68/103.88
  6. Step 6: Final answer
    x = 100.43

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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.