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Finding the Fourth Proportional to 643.34, 889.18 and 495.92

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Solution

The fourth proportional to 643.34, 889.18 and 495.92 is: 685.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.34 : 889.18 = 495.92 : x
  2. Step 2: Convert to fraction form
    643.34/889.18 = 495.92/x
  3. Step 3: Cross multiply
    643.34x = 889.18 × 495.92
  4. Step 4: Simplify right side
    643.34x = 440,962.15
  5. Step 5: Solve for x
    x = 440,962.15/643.34
  6. Step 6: Final answer
    x = 685.43

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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.