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Finding the Fourth Proportional to 725.28, 1,088.10 and 212.28

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Solution

The fourth proportional to 725.28, 1,088.10 and 212.28 is: 318.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.28 : 1,088.10 = 212.28 : x
  2. Step 2: Convert to fraction form
    725.28/1,088.10 = 212.28/x
  3. Step 3: Cross multiply
    725.28x = 1,088.10 × 212.28
  4. Step 4: Simplify right side
    725.28x = 230,981.87
  5. Step 5: Solve for x
    x = 230,981.87/725.28
  6. Step 6: Final answer
    x = 318.47

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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.