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Finding the Fourth Proportional to 72.53, 100.05 and 50.66

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Solution

The fourth proportional to 72.53, 100.05 and 50.66 is: 69.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.53 : 100.05 = 50.66 : x
  2. Step 2: Convert to fraction form
    72.53/100.05 = 50.66/x
  3. Step 3: Cross multiply
    72.53x = 100.05 × 50.66
  4. Step 4: Simplify right side
    72.53x = 5,068.03
  5. Step 5: Solve for x
    x = 5,068.03/72.53
  6. Step 6: Final answer
    x = 69.88

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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.