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Finding the Fourth Proportional to 72.25, 99.72 and 50.42

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Solution

The fourth proportional to 72.25, 99.72 and 50.42 is: 69.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.25 : 99.72 = 50.42 : x
  2. Step 2: Convert to fraction form
    72.25/99.72 = 50.42/x
  3. Step 3: Cross multiply
    72.25x = 99.72 × 50.42
  4. Step 4: Simplify right side
    72.25x = 5,028.13
  5. Step 5: Solve for x
    x = 5,028.13/72.25
  6. Step 6: Final answer
    x = 69.60

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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.