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Finding the Fourth Proportional to 415.40, 573.20 and 228.88

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Solution

The fourth proportional to 415.40, 573.20 and 228.88 is: 315.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.40 : 573.20 = 228.88 : x
  2. Step 2: Convert to fraction form
    415.40/573.20 = 228.88/x
  3. Step 3: Cross multiply
    415.40x = 573.20 × 228.88
  4. Step 4: Simplify right side
    415.40x = 131,194.02
  5. Step 5: Solve for x
    x = 131,194.02/415.40
  6. Step 6: Final answer
    x = 315.83

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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.