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Finding the Fourth Proportional to 553.22, 763.42 and 304.55

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Solution

The fourth proportional to 553.22, 763.42 and 304.55 is: 420.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.22 : 763.42 = 304.55 : x
  2. Step 2: Convert to fraction form
    553.22/763.42 = 304.55/x
  3. Step 3: Cross multiply
    553.22x = 763.42 × 304.55
  4. Step 4: Simplify right side
    553.22x = 232,498.80
  5. Step 5: Solve for x
    x = 232,498.80/553.22
  6. Step 6: Final answer
    x = 420.26

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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.