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Finding the Fourth Proportional to 72.79, 99.84 and 68.88

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Solution

The fourth proportional to 72.79, 99.84 and 68.88 is: 94.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.79 : 99.84 = 68.88 : x
  2. Step 2: Convert to fraction form
    72.79/99.84 = 68.88/x
  3. Step 3: Cross multiply
    72.79x = 99.84 × 68.88
  4. Step 4: Simplify right side
    72.79x = 6,876.48
  5. Step 5: Solve for x
    x = 6,876.48/72.79
  6. Step 6: Final answer
    x = 94.47

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.