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Finding the Fourth Proportional to 470.99, 649.47 and 331.06

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Solution

The fourth proportional to 470.99, 649.47 and 331.06 is: 456.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    470.99 : 649.47 = 331.06 : x
  2. Step 2: Convert to fraction form
    470.99/649.47 = 331.06/x
  3. Step 3: Cross multiply
    470.99x = 649.47 × 331.06
  4. Step 4: Simplify right side
    470.99x = 215,013.54
  5. Step 5: Solve for x
    x = 215,013.54/470.99
  6. Step 6: Final answer
    x = 456.51

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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.