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Finding the Fourth Proportional to 402.56, 555.51 and 225.49

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Solution

The fourth proportional to 402.56, 555.51 and 225.49 is: 311.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.56 : 555.51 = 225.49 : x
  2. Step 2: Convert to fraction form
    402.56/555.51 = 225.49/x
  3. Step 3: Cross multiply
    402.56x = 555.51 × 225.49
  4. Step 4: Simplify right side
    402.56x = 125,261.10
  5. Step 5: Solve for x
    x = 125,261.10/402.56
  6. Step 6: Final answer
    x = 311.16

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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.