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Finding the Fourth Proportional to 470.45, 648.54 and 330.15

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Solution

The fourth proportional to 470.45, 648.54 and 330.15 is: 455.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    470.45 : 648.54 = 330.15 : x
  2. Step 2: Convert to fraction form
    470.45/648.54 = 330.15/x
  3. Step 3: Cross multiply
    470.45x = 648.54 × 330.15
  4. Step 4: Simplify right side
    470.45x = 214,110.59
  5. Step 5: Solve for x
    x = 214,110.59/470.45
  6. Step 6: Final answer
    x = 455.12

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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.