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Finding the Fourth Proportional to 72.43, 109.03 and 66.37

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Solution

The fourth proportional to 72.43, 109.03 and 66.37 is: 99.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.43 : 109.03 = 66.37 : x
  2. Step 2: Convert to fraction form
    72.43/109.03 = 66.37/x
  3. Step 3: Cross multiply
    72.43x = 109.03 × 66.37
  4. Step 4: Simplify right side
    72.43x = 7,235.78
  5. Step 5: Solve for x
    x = 7,235.78/72.43
  6. Step 6: Final answer
    x = 99.91

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.