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Finding the Fourth Proportional to 643.39, 887.85 and 363.63

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Solution

The fourth proportional to 643.39, 887.85 and 363.63 is: 501.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.39 : 887.85 = 363.63 : x
  2. Step 2: Convert to fraction form
    643.39/887.85 = 363.63/x
  3. Step 3: Cross multiply
    643.39x = 887.85 × 363.63
  4. Step 4: Simplify right side
    643.39x = 322,848.90
  5. Step 5: Solve for x
    x = 322,848.90/643.39
  6. Step 6: Final answer
    x = 501.79

Related Problems

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Double scale
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Similar ratio
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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.