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Finding the Fourth Proportional to 474.21, 711.86 and 447.21

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Solution

The fourth proportional to 474.21, 711.86 and 447.21 is: 671.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    474.21 : 711.86 = 447.21 : x
  2. Step 2: Convert to fraction form
    474.21/711.86 = 447.21/x
  3. Step 3: Cross multiply
    474.21x = 711.86 × 447.21
  4. Step 4: Simplify right side
    474.21x = 318,348.67
  5. Step 5: Solve for x
    x = 318,348.67/474.21
  6. Step 6: Final answer
    x = 671.32

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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.