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Finding the Fourth Proportional to 402.56, 555.21 and 253.11

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Solution

The fourth proportional to 402.56, 555.21 and 253.11 is: 349.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.56 : 555.21 = 253.11 : x
  2. Step 2: Convert to fraction form
    402.56/555.21 = 253.11/x
  3. Step 3: Cross multiply
    402.56x = 555.21 × 253.11
  4. Step 4: Simplify right side
    402.56x = 140,529.20
  5. Step 5: Solve for x
    x = 140,529.20/402.56
  6. Step 6: Final answer
    x = 349.09

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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.