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Finding the Fourth Proportional to 470.66, 647.44 and 443.78

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Solution

The fourth proportional to 470.66, 647.44 and 443.78 is: 610.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    470.66 : 647.44 = 443.78 : x
  2. Step 2: Convert to fraction form
    470.66/647.44 = 443.78/x
  3. Step 3: Cross multiply
    470.66x = 647.44 × 443.78
  4. Step 4: Simplify right side
    470.66x = 287,321.50
  5. Step 5: Solve for x
    x = 287,321.50/470.66
  6. Step 6: Final answer
    x = 610.46

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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.