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Finding the Fourth Proportional to 643.89, 887.28 and 466.55

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Solution

The fourth proportional to 643.89, 887.28 and 466.55 is: 642.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.89 : 887.28 = 466.55 : x
  2. Step 2: Convert to fraction form
    643.89/887.28 = 466.55/x
  3. Step 3: Cross multiply
    643.89x = 887.28 × 466.55
  4. Step 4: Simplify right side
    643.89x = 413,956.05
  5. Step 5: Solve for x
    x = 413,956.05/643.89
  6. Step 6: Final answer
    x = 642.90

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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.