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Finding the Fourth Proportional to 643.19, 887.39 and 363.39

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Solution

The fourth proportional to 643.19, 887.39 and 363.39 is: 501.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.19 : 887.39 = 363.39 : x
  2. Step 2: Convert to fraction form
    643.19/887.39 = 363.39/x
  3. Step 3: Cross multiply
    643.19x = 887.39 × 363.39
  4. Step 4: Simplify right side
    643.19x = 322,468.65
  5. Step 5: Solve for x
    x = 322,468.65/643.19
  6. Step 6: Final answer
    x = 501.36

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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.