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Finding the Fourth Proportional to 529.20, 789.30 and 447.45

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Solution

The fourth proportional to 529.20, 789.30 and 447.45 is: 667.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    529.20 : 789.30 = 447.45 : x
  2. Step 2: Convert to fraction form
    529.20/789.30 = 447.45/x
  3. Step 3: Cross multiply
    529.20x = 789.30 × 447.45
  4. Step 4: Simplify right side
    529.20x = 353,172.29
  5. Step 5: Solve for x
    x = 353,172.29/529.20
  6. Step 6: Final answer
    x = 667.37

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.