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Finding the Fourth Proportional to 687.86, 949.43 and 393.23

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Solution

The fourth proportional to 687.86, 949.43 and 393.23 is: 542.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.86 : 949.43 = 393.23 : x
  2. Step 2: Convert to fraction form
    687.86/949.43 = 393.23/x
  3. Step 3: Cross multiply
    687.86x = 949.43 × 393.23
  4. Step 4: Simplify right side
    687.86x = 373,344.36
  5. Step 5: Solve for x
    x = 373,344.36/687.86
  6. Step 6: Final answer
    x = 542.76

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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.