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Finding the Fourth Proportional to 660.93, 912.23 and 398.89

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Solution

The fourth proportional to 660.93, 912.23 and 398.89 is: 550.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.93 : 912.23 = 398.89 : x
  2. Step 2: Convert to fraction form
    660.93/912.23 = 398.89/x
  3. Step 3: Cross multiply
    660.93x = 912.23 × 398.89
  4. Step 4: Simplify right side
    660.93x = 363,879.42
  5. Step 5: Solve for x
    x = 363,879.42/660.93
  6. Step 6: Final answer
    x = 550.56

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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.