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Finding the Fourth Proportional to 402.90, 556.06 and 228.20

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Solution

The fourth proportional to 402.90, 556.06 and 228.20 is: 314.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.90 : 556.06 = 228.20 : x
  2. Step 2: Convert to fraction form
    402.90/556.06 = 228.20/x
  3. Step 3: Cross multiply
    402.90x = 556.06 × 228.20
  4. Step 4: Simplify right side
    402.90x = 126,892.89
  5. Step 5: Solve for x
    x = 126,892.89/402.90
  6. Step 6: Final answer
    x = 314.95

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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.