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Finding the Fourth Proportional to 470.49, 648.78 and 330.56

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Solution

The fourth proportional to 470.49, 648.78 and 330.56 is: 455.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    470.49 : 648.78 = 330.56 : x
  2. Step 2: Convert to fraction form
    470.49/648.78 = 330.56/x
  3. Step 3: Cross multiply
    470.49x = 648.78 × 330.56
  4. Step 4: Simplify right side
    470.49x = 214,460.72
  5. Step 5: Solve for x
    x = 214,460.72/470.49
  6. Step 6: Final answer
    x = 455.82

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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.