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Finding the Fourth Proportional to 402.78, 555.86 and 228.13

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Solution

The fourth proportional to 402.78, 555.86 and 228.13 is: 314.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.78 : 555.86 = 228.13 : x
  2. Step 2: Convert to fraction form
    402.78/555.86 = 228.13/x
  3. Step 3: Cross multiply
    402.78x = 555.86 × 228.13
  4. Step 4: Simplify right side
    402.78x = 126,808.34
  5. Step 5: Solve for x
    x = 126,808.34/402.78
  6. Step 6: Final answer
    x = 314.83

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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.