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Finding the Fourth Proportional to 447.20, 670.54 and 215.91

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Solution

The fourth proportional to 447.20, 670.54 and 215.91 is: 323.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.20 : 670.54 = 215.91 : x
  2. Step 2: Convert to fraction form
    447.20/670.54 = 215.91/x
  3. Step 3: Cross multiply
    447.20x = 670.54 × 215.91
  4. Step 4: Simplify right side
    447.20x = 144,776.29
  5. Step 5: Solve for x
    x = 144,776.29/447.20
  6. Step 6: Final answer
    x = 323.74

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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.