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Finding the Fourth Proportional to 572.28, 789.68 and 422.98

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Solution

The fourth proportional to 572.28, 789.68 and 422.98 is: 583.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.28 : 789.68 = 422.98 : x
  2. Step 2: Convert to fraction form
    572.28/789.68 = 422.98/x
  3. Step 3: Cross multiply
    572.28x = 789.68 × 422.98
  4. Step 4: Simplify right side
    572.28x = 334,018.85
  5. Step 5: Solve for x
    x = 334,018.85/572.28
  6. Step 6: Final answer
    x = 583.66

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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.