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Finding the Fourth Proportional to 569.84, 853.20 and 447.39

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Solution

The fourth proportional to 569.84, 853.20 and 447.39 is: 669.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    569.84 : 853.20 = 447.39 : x
  2. Step 2: Convert to fraction form
    569.84/853.20 = 447.39/x
  3. Step 3: Cross multiply
    569.84x = 853.20 × 447.39
  4. Step 4: Simplify right side
    569.84x = 381,713.15
  5. Step 5: Solve for x
    x = 381,713.15/569.84
  6. Step 6: Final answer
    x = 669.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.