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Finding the Fourth Proportional to 643.92, 888.27 and 407.43

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Solution

The fourth proportional to 643.92, 888.27 and 407.43 is: 562.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.92 : 888.27 = 407.43 : x
  2. Step 2: Convert to fraction form
    643.92/888.27 = 407.43/x
  3. Step 3: Cross multiply
    643.92x = 888.27 × 407.43
  4. Step 4: Simplify right side
    643.92x = 361,907.85
  5. Step 5: Solve for x
    x = 361,907.85/643.92
  6. Step 6: Final answer
    x = 562.04

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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.