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Finding the Fourth Proportional to 553.50, 763.80 and 304.82

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Solution

The fourth proportional to 553.50, 763.80 and 304.82 is: 420.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.50 : 763.80 = 304.82 : x
  2. Step 2: Convert to fraction form
    553.50/763.80 = 304.82/x
  3. Step 3: Cross multiply
    553.50x = 763.80 × 304.82
  4. Step 4: Simplify right side
    553.50x = 232,817.70
  5. Step 5: Solve for x
    x = 232,817.70/553.50
  6. Step 6: Final answer
    x = 420.63

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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.