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Finding the Fourth Proportional to 547.97, 756.21 and 315.09

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Solution

The fourth proportional to 547.97, 756.21 and 315.09 is: 434.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    547.97 : 756.21 = 315.09 : x
  2. Step 2: Convert to fraction form
    547.97/756.21 = 315.09/x
  3. Step 3: Cross multiply
    547.97x = 756.21 × 315.09
  4. Step 4: Simplify right side
    547.97x = 238,274.21
  5. Step 5: Solve for x
    x = 238,274.21/547.97
  6. Step 6: Final answer
    x = 434.83

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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.