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Finding the Fourth Proportional to 643.92, 887.99 and 519.51

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Solution

The fourth proportional to 643.92, 887.99 and 519.51 is: 716.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.92 : 887.99 = 519.51 : x
  2. Step 2: Convert to fraction form
    643.92/887.99 = 519.51/x
  3. Step 3: Cross multiply
    643.92x = 887.99 × 519.51
  4. Step 4: Simplify right side
    643.92x = 461,319.68
  5. Step 5: Solve for x
    x = 461,319.68/643.92
  6. Step 6: Final answer
    x = 716.42

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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.