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Finding the Fourth Proportional to 891.25, 1,337.21 and 343.31

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Solution

The fourth proportional to 891.25, 1,337.21 and 343.31 is: 515.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.25 : 1,337.21 = 343.31 : x
  2. Step 2: Convert to fraction form
    891.25/1,337.21 = 343.31/x
  3. Step 3: Cross multiply
    891.25x = 1,337.21 × 343.31
  4. Step 4: Simplify right side
    891.25x = 459,070.45
  5. Step 5: Solve for x
    x = 459,070.45/891.25
  6. Step 6: Final answer
    x = 515.08

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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.