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Finding the Fourth Proportional to 553.21, 763.43 and 304.53

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Solution

The fourth proportional to 553.21, 763.43 and 304.53 is: 420.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.21 : 763.43 = 304.53 : x
  2. Step 2: Convert to fraction form
    553.21/763.43 = 304.53/x
  3. Step 3: Cross multiply
    553.21x = 763.43 × 304.53
  4. Step 4: Simplify right side
    553.21x = 232,487.34
  5. Step 5: Solve for x
    x = 232,487.34/553.21
  6. Step 6: Final answer
    x = 420.25

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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.