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Finding the Fourth Proportional to 470.53, 648.95 and 331.11

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Solution

The fourth proportional to 470.53, 648.95 and 331.11 is: 456.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    470.53 : 648.95 = 331.11 : x
  2. Step 2: Convert to fraction form
    470.53/648.95 = 331.11/x
  3. Step 3: Cross multiply
    470.53x = 648.95 × 331.11
  4. Step 4: Simplify right side
    470.53x = 214,871.58
  5. Step 5: Solve for x
    x = 214,871.58/470.53
  6. Step 6: Final answer
    x = 456.66

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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.