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Finding the Fourth Proportional to 415.07, 572.78 and 228.56

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Solution

The fourth proportional to 415.07, 572.78 and 228.56 is: 315.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.07 : 572.78 = 228.56 : x
  2. Step 2: Convert to fraction form
    415.07/572.78 = 228.56/x
  3. Step 3: Cross multiply
    415.07x = 572.78 × 228.56
  4. Step 4: Simplify right side
    415.07x = 130,912.30
  5. Step 5: Solve for x
    x = 130,912.30/415.07
  6. Step 6: Final answer
    x = 315.40

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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.