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Finding the Fourth Proportional to 660.58, 911.42 and 398.68

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Solution

The fourth proportional to 660.58, 911.42 and 398.68 is: 550.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.58 : 911.42 = 398.68 : x
  2. Step 2: Convert to fraction form
    660.58/911.42 = 398.68/x
  3. Step 3: Cross multiply
    660.58x = 911.42 × 398.68
  4. Step 4: Simplify right side
    660.58x = 363,364.93
  5. Step 5: Solve for x
    x = 363,364.93/660.58
  6. Step 6: Final answer
    x = 550.07

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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.