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Finding the Fourth Proportional to 547.80, 755.83 and 311.75

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Solution

The fourth proportional to 547.80, 755.83 and 311.75 is: 430.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    547.80 : 755.83 = 311.75 : x
  2. Step 2: Convert to fraction form
    547.80/755.83 = 311.75/x
  3. Step 3: Cross multiply
    547.80x = 755.83 × 311.75
  4. Step 4: Simplify right side
    547.80x = 235,630.00
  5. Step 5: Solve for x
    x = 235,630.00/547.80
  6. Step 6: Final answer
    x = 430.14

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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.