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Finding the Fourth Proportional to 422.81, 583.36 and 393.45

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Solution

The fourth proportional to 422.81, 583.36 and 393.45 is: 542.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.81 : 583.36 = 393.45 : x
  2. Step 2: Convert to fraction form
    422.81/583.36 = 393.45/x
  3. Step 3: Cross multiply
    422.81x = 583.36 × 393.45
  4. Step 4: Simplify right side
    422.81x = 229,522.99
  5. Step 5: Solve for x
    x = 229,522.99/422.81
  6. Step 6: Final answer
    x = 542.85

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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.