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Finding the Fourth Proportional to 643.92, 888.70 and 382.02

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Solution

The fourth proportional to 643.92, 888.70 and 382.02 is: 527.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.92 : 888.70 = 382.02 : x
  2. Step 2: Convert to fraction form
    643.92/888.70 = 382.02/x
  3. Step 3: Cross multiply
    643.92x = 888.70 × 382.02
  4. Step 4: Simplify right side
    643.92x = 339,501.17
  5. Step 5: Solve for x
    x = 339,501.17/643.92
  6. Step 6: Final answer
    x = 527.24

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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.