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Finding the Fourth Proportional to 618.41, 852.65 and 470.79

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Solution

The fourth proportional to 618.41, 852.65 and 470.79 is: 649.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.41 : 852.65 = 470.79 : x
  2. Step 2: Convert to fraction form
    618.41/852.65 = 470.79/x
  3. Step 3: Cross multiply
    618.41x = 852.65 × 470.79
  4. Step 4: Simplify right side
    618.41x = 401,419.09
  5. Step 5: Solve for x
    x = 401,419.09/618.41
  6. Step 6: Final answer
    x = 649.11

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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.