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Finding the Fourth Proportional to 643.55, 888.09 and 363.75

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Solution

The fourth proportional to 643.55, 888.09 and 363.75 is: 501.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.55 : 888.09 = 363.75 : x
  2. Step 2: Convert to fraction form
    643.55/888.09 = 363.75/x
  3. Step 3: Cross multiply
    643.55x = 888.09 × 363.75
  4. Step 4: Simplify right side
    643.55x = 323,042.74
  5. Step 5: Solve for x
    x = 323,042.74/643.55
  6. Step 6: Final answer
    x = 501.97

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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.