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Finding the Fourth Proportional to 725.28, 1,086.36 and 358.98

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Solution

The fourth proportional to 725.28, 1,086.36 and 358.98 is: 537.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.28 : 1,086.36 = 358.98 : x
  2. Step 2: Convert to fraction form
    725.28/1,086.36 = 358.98/x
  3. Step 3: Cross multiply
    725.28x = 1,086.36 × 358.98
  4. Step 4: Simplify right side
    725.28x = 389,981.51
  5. Step 5: Solve for x
    x = 389,981.51/725.28
  6. Step 6: Final answer
    x = 537.70

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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.