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Finding the Fourth Proportional to 643.35, 887.25 and 518.97

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Solution

The fourth proportional to 643.35, 887.25 and 518.97 is: 715.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.35 : 887.25 = 518.97 : x
  2. Step 2: Convert to fraction form
    643.35/887.25 = 518.97/x
  3. Step 3: Cross multiply
    643.35x = 887.25 × 518.97
  4. Step 4: Simplify right side
    643.35x = 460,456.13
  5. Step 5: Solve for x
    x = 460,456.13/643.35
  6. Step 6: Final answer
    x = 715.72

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.