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Finding the Fourth Proportional to 725.72, 1,088.76 and 212.72

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Solution

The fourth proportional to 725.72, 1,088.76 and 212.72 is: 319.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.72 : 1,088.76 = 212.72 : x
  2. Step 2: Convert to fraction form
    725.72/1,088.76 = 212.72/x
  3. Step 3: Cross multiply
    725.72x = 1,088.76 × 212.72
  4. Step 4: Simplify right side
    725.72x = 231,601.03
  5. Step 5: Solve for x
    x = 231,601.03/725.72
  6. Step 6: Final answer
    x = 319.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.