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Finding the Fourth Proportional to 1,249.63, 1,724.09 and 718.37

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Solution

The fourth proportional to 1,249.63, 1,724.09 and 718.37 is: 991.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,249.63 : 1,724.09 = 718.37 : x
  2. Step 2: Convert to fraction form
    1,249.63/1,724.09 = 718.37/x
  3. Step 3: Cross multiply
    1,249.63x = 1,724.09 × 718.37
  4. Step 4: Simplify right side
    1,249.63x = 1,238,528.79
  5. Step 5: Solve for x
    x = 1,238,528.79/1,249.63
  6. Step 6: Final answer
    x = 991.12

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1.5x scale

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.