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Finding the Fourth Proportional to 402.69, 555.81 and 228.14

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Solution

The fourth proportional to 402.69, 555.81 and 228.14 is: 314.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.69 : 555.81 = 228.14 : x
  2. Step 2: Convert to fraction form
    402.69/555.81 = 228.14/x
  3. Step 3: Cross multiply
    402.69x = 555.81 × 228.14
  4. Step 4: Simplify right side
    402.69x = 126,802.49
  5. Step 5: Solve for x
    x = 126,802.49/402.69
  6. Step 6: Final answer
    x = 314.89

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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.