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Finding the Fourth Proportional to 643.56, 887.88 and 422.63

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Solution

The fourth proportional to 643.56, 887.88 and 422.63 is: 583.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.56 : 887.88 = 422.63 : x
  2. Step 2: Convert to fraction form
    643.56/887.88 = 422.63/x
  3. Step 3: Cross multiply
    643.56x = 887.88 × 422.63
  4. Step 4: Simplify right side
    643.56x = 375,244.72
  5. Step 5: Solve for x
    x = 375,244.72/643.56
  6. Step 6: Final answer
    x = 583.08

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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.