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Finding the Fourth Proportional to 422.58, 583.29 and 391.80

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Solution

The fourth proportional to 422.58, 583.29 and 391.80 is: 540.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.58 : 583.29 = 391.80 : x
  2. Step 2: Convert to fraction form
    422.58/583.29 = 391.80/x
  3. Step 3: Cross multiply
    422.58x = 583.29 × 391.80
  4. Step 4: Simplify right side
    422.58x = 228,533.02
  5. Step 5: Solve for x
    x = 228,533.02/422.58
  6. Step 6: Final answer
    x = 540.80

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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.