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Finding the Fourth Proportional to 643.47, 888.08 and 394.75

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Solution

The fourth proportional to 643.47, 888.08 and 394.75 is: 544.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.47 : 888.08 = 394.75 : x
  2. Step 2: Convert to fraction form
    643.47/888.08 = 394.75/x
  3. Step 3: Cross multiply
    643.47x = 888.08 × 394.75
  4. Step 4: Simplify right side
    643.47x = 350,565.39
  5. Step 5: Solve for x
    x = 350,565.39/643.47
  6. Step 6: Final answer
    x = 544.80

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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.