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Finding the Fourth Proportional to 643.48, 888.05 and 394.74

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Solution

The fourth proportional to 643.48, 888.05 and 394.74 is: 544.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.48 : 888.05 = 394.74 : x
  2. Step 2: Convert to fraction form
    643.48/888.05 = 394.74/x
  3. Step 3: Cross multiply
    643.48x = 888.05 × 394.74
  4. Step 4: Simplify right side
    643.48x = 350,549.84
  5. Step 5: Solve for x
    x = 350,549.84/643.48
  6. Step 6: Final answer
    x = 544.77

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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.