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Finding the Fourth Proportional to 643.33, 887.11 and 477.28

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Solution

The fourth proportional to 643.33, 887.11 and 477.28 is: 658.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.33 : 887.11 = 477.28 : x
  2. Step 2: Convert to fraction form
    643.33/887.11 = 477.28/x
  3. Step 3: Cross multiply
    643.33x = 887.11 × 477.28
  4. Step 4: Simplify right side
    643.33x = 423,399.86
  5. Step 5: Solve for x
    x = 423,399.86/643.33
  6. Step 6: Final answer
    x = 658.14

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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.