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Finding the Fourth Proportional to 643.49, 888.02 and 394.94

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Solution

The fourth proportional to 643.49, 888.02 and 394.94 is: 545.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.49 : 888.02 = 394.94 : x
  2. Step 2: Convert to fraction form
    643.49/888.02 = 394.94/x
  3. Step 3: Cross multiply
    643.49x = 888.02 × 394.94
  4. Step 4: Simplify right side
    643.49x = 350,711.17
  5. Step 5: Solve for x
    x = 350,711.17/643.49
  6. Step 6: Final answer
    x = 545.02

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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.