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Finding the Fourth Proportional to 653.27, 979.39 and 447.21

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Solution

The fourth proportional to 653.27, 979.39 and 447.21 is: 670.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.27 : 979.39 = 447.21 : x
  2. Step 2: Convert to fraction form
    653.27/979.39 = 447.21/x
  3. Step 3: Cross multiply
    653.27x = 979.39 × 447.21
  4. Step 4: Simplify right side
    653.27x = 437,994.56
  5. Step 5: Solve for x
    x = 437,994.56/653.27
  6. Step 6: Final answer
    x = 670.47

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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.