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Finding the Fourth Proportional to 643.37, 887.41 and 520.35

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Solution

The fourth proportional to 643.37, 887.41 and 520.35 is: 717.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.37 : 887.41 = 520.35 : x
  2. Step 2: Convert to fraction form
    643.37/887.41 = 520.35/x
  3. Step 3: Cross multiply
    643.37x = 887.41 × 520.35
  4. Step 4: Simplify right side
    643.37x = 461,763.79
  5. Step 5: Solve for x
    x = 461,763.79/643.37
  6. Step 6: Final answer
    x = 717.73

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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.