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Finding the Fourth Proportional to 643.21, 887.60 and 363.43

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Solution

The fourth proportional to 643.21, 887.60 and 363.43 is: 501.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.21 : 887.60 = 363.43 : x
  2. Step 2: Convert to fraction form
    643.21/887.60 = 363.43/x
  3. Step 3: Cross multiply
    643.21x = 887.60 × 363.43
  4. Step 4: Simplify right side
    643.21x = 322,582.49
  5. Step 5: Solve for x
    x = 322,582.49/643.21
  6. Step 6: Final answer
    x = 501.52

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Double scale
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1.5x scale

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.