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Finding the Fourth Proportional to 72.49, 99.89 and 51.79

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Solution

The fourth proportional to 72.49, 99.89 and 51.79 is: 71.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.49 : 99.89 = 51.79 : x
  2. Step 2: Convert to fraction form
    72.49/99.89 = 51.79/x
  3. Step 3: Cross multiply
    72.49x = 99.89 × 51.79
  4. Step 4: Simplify right side
    72.49x = 5,173.30
  5. Step 5: Solve for x
    x = 5,173.30/72.49
  6. Step 6: Final answer
    x = 71.37

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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.