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Finding the Fourth Proportional to 891.36, 1,336.86 and 343.40

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Solution

The fourth proportional to 891.36, 1,336.86 and 343.40 is: 515.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.36 : 1,336.86 = 343.40 : x
  2. Step 2: Convert to fraction form
    891.36/1,336.86 = 343.40/x
  3. Step 3: Cross multiply
    891.36x = 1,336.86 × 343.40
  4. Step 4: Simplify right side
    891.36x = 459,077.72
  5. Step 5: Solve for x
    x = 459,077.72/891.36
  6. Step 6: Final answer
    x = 515.03

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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.