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Finding the Fourth Proportional to 547.70, 755.86 and 311.72

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Solution

The fourth proportional to 547.70, 755.86 and 311.72 is: 430.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    547.70 : 755.86 = 311.72 : x
  2. Step 2: Convert to fraction form
    547.70/755.86 = 311.72/x
  3. Step 3: Cross multiply
    547.70x = 755.86 × 311.72
  4. Step 4: Simplify right side
    547.70x = 235,618.79
  5. Step 5: Solve for x
    x = 235,618.79/547.70
  6. Step 6: Final answer
    x = 430.20

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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.