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Finding the Fourth Proportional to 618.76, 851.94 and 470.92

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Solution

The fourth proportional to 618.76, 851.94 and 470.92 is: 648.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.76 : 851.94 = 470.92 : x
  2. Step 2: Convert to fraction form
    618.76/851.94 = 470.92/x
  3. Step 3: Cross multiply
    618.76x = 851.94 × 470.92
  4. Step 4: Simplify right side
    618.76x = 401,195.58
  5. Step 5: Solve for x
    x = 401,195.58/618.76
  6. Step 6: Final answer
    x = 648.39

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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.