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Finding the Fourth Proportional to 72.32, 99.79 and 43.21

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Solution

The fourth proportional to 72.32, 99.79 and 43.21 is: 59.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.32 : 99.79 = 43.21 : x
  2. Step 2: Convert to fraction form
    72.32/99.79 = 43.21/x
  3. Step 3: Cross multiply
    72.32x = 99.79 × 43.21
  4. Step 4: Simplify right side
    72.32x = 4,311.93
  5. Step 5: Solve for x
    x = 4,311.93/72.32
  6. Step 6: Final answer
    x = 59.62

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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.