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Finding the Fourth Proportional to 640.29, 881.76 and 443.46

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Solution

The fourth proportional to 640.29, 881.76 and 443.46 is: 610.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.29 : 881.76 = 443.46 : x
  2. Step 2: Convert to fraction form
    640.29/881.76 = 443.46/x
  3. Step 3: Cross multiply
    640.29x = 881.76 × 443.46
  4. Step 4: Simplify right side
    640.29x = 391,025.29
  5. Step 5: Solve for x
    x = 391,025.29/640.29
  6. Step 6: Final answer
    x = 610.70

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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.