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Finding the Fourth Proportional to 547.98, 756.30 and 311.93

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Solution

The fourth proportional to 547.98, 756.30 and 311.93 is: 430.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    547.98 : 756.30 = 311.93 : x
  2. Step 2: Convert to fraction form
    547.98/756.30 = 311.93/x
  3. Step 3: Cross multiply
    547.98x = 756.30 × 311.93
  4. Step 4: Simplify right side
    547.98x = 235,912.66
  5. Step 5: Solve for x
    x = 235,912.66/547.98
  6. Step 6: Final answer
    x = 430.51

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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.