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Finding the Fourth Proportional to 905.51, 1,249.20 and 695.31

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Solution

The fourth proportional to 905.51, 1,249.20 and 695.31 is: 959.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.51 : 1,249.20 = 695.31 : x
  2. Step 2: Convert to fraction form
    905.51/1,249.20 = 695.31/x
  3. Step 3: Cross multiply
    905.51x = 1,249.20 × 695.31
  4. Step 4: Simplify right side
    905.51x = 868,581.25
  5. Step 5: Solve for x
    x = 868,581.25/905.51
  6. Step 6: Final answer
    x = 959.22

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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.