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Finding the Fourth Proportional to 573.71, 791.70 and 311.72

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Solution

The fourth proportional to 573.71, 791.70 and 311.72 is: 430.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    573.71 : 791.70 = 311.72 : x
  2. Step 2: Convert to fraction form
    573.71/791.70 = 311.72/x
  3. Step 3: Cross multiply
    573.71x = 791.70 × 311.72
  4. Step 4: Simplify right side
    573.71x = 246,787.17
  5. Step 5: Solve for x
    x = 246,787.17/573.71
  6. Step 6: Final answer
    x = 430.16

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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.