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Finding the Fourth Proportional to 911.76, 1,366.68 and 398.16

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Solution

The fourth proportional to 911.76, 1,366.68 and 398.16 is: 596.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.76 : 1,366.68 = 398.16 : x
  2. Step 2: Convert to fraction form
    911.76/1,366.68 = 398.16/x
  3. Step 3: Cross multiply
    911.76x = 1,366.68 × 398.16
  4. Step 4: Simplify right side
    911.76x = 544,157.31
  5. Step 5: Solve for x
    x = 544,157.31/911.76
  6. Step 6: Final answer
    x = 596.82

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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.