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Finding the Fourth Proportional to 911.86, 1,366.83 and 398.74

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Solution

The fourth proportional to 911.86, 1,366.83 and 398.74 is: 597.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.86 : 1,366.83 = 398.74 : x
  2. Step 2: Convert to fraction form
    911.86/1,366.83 = 398.74/x
  3. Step 3: Cross multiply
    911.86x = 1,366.83 × 398.74
  4. Step 4: Simplify right side
    911.86x = 545,009.79
  5. Step 5: Solve for x
    x = 545,009.79/911.86
  6. Step 6: Final answer
    x = 597.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.