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Finding the Fourth Proportional to 474.20, 711.30 and 447.20

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Solution

The fourth proportional to 474.20, 711.30 and 447.20 is: 670.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    474.20 : 711.30 = 447.20 : x
  2. Step 2: Convert to fraction form
    474.20/711.30 = 447.20/x
  3. Step 3: Cross multiply
    474.20x = 711.30 × 447.20
  4. Step 4: Simplify right side
    474.20x = 318,093.36
  5. Step 5: Solve for x
    x = 318,093.36/474.20
  6. Step 6: Final answer
    x = 670.80

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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.