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Finding the Fourth Proportional to 644.23, 886.98 and 447.40

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Solution

The fourth proportional to 644.23, 886.98 and 447.40 is: 615.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.23 : 886.98 = 447.40 : x
  2. Step 2: Convert to fraction form
    644.23/886.98 = 447.40/x
  3. Step 3: Cross multiply
    644.23x = 886.98 × 447.40
  4. Step 4: Simplify right side
    644.23x = 396,834.85
  5. Step 5: Solve for x
    x = 396,834.85/644.23
  6. Step 6: Final answer
    x = 615.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.