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Finding the Fourth Proportional to 905.49, 1,249.61 and 556.29

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Solution

The fourth proportional to 905.49, 1,249.61 and 556.29 is: 767.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.49 : 1,249.61 = 556.29 : x
  2. Step 2: Convert to fraction form
    905.49/1,249.61 = 556.29/x
  3. Step 3: Cross multiply
    905.49x = 1,249.61 × 556.29
  4. Step 4: Simplify right side
    905.49x = 695,145.55
  5. Step 5: Solve for x
    x = 695,145.55/905.49
  6. Step 6: Final answer
    x = 767.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.