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Finding the Fourth Proportional to 547.19, 755.04 and 311.15

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Solution

The fourth proportional to 547.19, 755.04 and 311.15 is: 429.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    547.19 : 755.04 = 311.15 : x
  2. Step 2: Convert to fraction form
    547.19/755.04 = 311.15/x
  3. Step 3: Cross multiply
    547.19x = 755.04 × 311.15
  4. Step 4: Simplify right side
    547.19x = 234,926.92
  5. Step 5: Solve for x
    x = 234,926.92/547.19
  6. Step 6: Final answer
    x = 429.34

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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.