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Finding the Fourth Proportional to 103.72, 143.07 and 72.59

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Solution

The fourth proportional to 103.72, 143.07 and 72.59 is: 100.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.72 : 143.07 = 72.59 : x
  2. Step 2: Convert to fraction form
    103.72/143.07 = 72.59/x
  3. Step 3: Cross multiply
    103.72x = 143.07 × 72.59
  4. Step 4: Simplify right side
    103.72x = 10,385.45
  5. Step 5: Solve for x
    x = 10,385.45/103.72
  6. Step 6: Final answer
    x = 100.13

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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.