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Finding the Fourth Proportional to 716.39, 1,074.31 and 305.31

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Solution

The fourth proportional to 716.39, 1,074.31 and 305.31 is: 457.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.39 : 1,074.31 = 305.31 : x
  2. Step 2: Convert to fraction form
    716.39/1,074.31 = 305.31/x
  3. Step 3: Cross multiply
    716.39x = 1,074.31 × 305.31
  4. Step 4: Simplify right side
    716.39x = 327,996.82
  5. Step 5: Solve for x
    x = 327,996.82/716.39
  6. Step 6: Final answer
    x = 457.85

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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.