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Finding the Fourth Proportional to 573.90, 791.98 and 311.92

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Solution

The fourth proportional to 573.90, 791.98 and 311.92 is: 430.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    573.90 : 791.98 = 311.92 : x
  2. Step 2: Convert to fraction form
    573.90/791.98 = 311.92/x
  3. Step 3: Cross multiply
    573.90x = 791.98 × 311.92
  4. Step 4: Simplify right side
    573.90x = 247,032.81
  5. Step 5: Solve for x
    x = 247,032.81/573.90
  6. Step 6: Final answer
    x = 430.44

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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.