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Finding the Fourth Proportional to 445.23, 670.71 and 439.56

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Solution

The fourth proportional to 445.23, 670.71 and 439.56 is: 662.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.23 : 670.71 = 439.56 : x
  2. Step 2: Convert to fraction form
    445.23/670.71 = 439.56/x
  3. Step 3: Cross multiply
    445.23x = 670.71 × 439.56
  4. Step 4: Simplify right side
    445.23x = 294,818.94
  5. Step 5: Solve for x
    x = 294,818.94/445.23
  6. Step 6: Final answer
    x = 662.17

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.