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Finding the Fourth Proportional to 72.64, 99.72 and 68.56

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Solution

The fourth proportional to 72.64, 99.72 and 68.56 is: 94.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.64 : 99.72 = 68.56 : x
  2. Step 2: Convert to fraction form
    72.64/99.72 = 68.56/x
  3. Step 3: Cross multiply
    72.64x = 99.72 × 68.56
  4. Step 4: Simplify right side
    72.64x = 6,836.80
  5. Step 5: Solve for x
    x = 6,836.80/72.64
  6. Step 6: Final answer
    x = 94.12

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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.