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Finding the Fourth Proportional to 72.51, 99.81 and 50.64

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Solution

The fourth proportional to 72.51, 99.81 and 50.64 is: 69.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.51 : 99.81 = 50.64 : x
  2. Step 2: Convert to fraction form
    72.51/99.81 = 50.64/x
  3. Step 3: Cross multiply
    72.51x = 99.81 × 50.64
  4. Step 4: Simplify right side
    72.51x = 5,054.38
  5. Step 5: Solve for x
    x = 5,054.38/72.51
  6. Step 6: Final answer
    x = 69.71

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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.