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Finding the Fourth Proportional to 725.94, 1,089.38 and 315.16

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Solution

The fourth proportional to 725.94, 1,089.38 and 315.16 is: 472.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.94 : 1,089.38 = 315.16 : x
  2. Step 2: Convert to fraction form
    725.94/1,089.38 = 315.16/x
  3. Step 3: Cross multiply
    725.94x = 1,089.38 × 315.16
  4. Step 4: Simplify right side
    725.94x = 343,329.00
  5. Step 5: Solve for x
    x = 343,329.00/725.94
  6. Step 6: Final answer
    x = 472.94

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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.