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Finding the Fourth Proportional to 1,249.36, 1,724.09 and 718.25

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Solution

The fourth proportional to 1,249.36, 1,724.09 and 718.25 is: 991.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,249.36 : 1,724.09 = 718.25 : x
  2. Step 2: Convert to fraction form
    1,249.36/1,724.09 = 718.25/x
  3. Step 3: Cross multiply
    1,249.36x = 1,724.09 × 718.25
  4. Step 4: Simplify right side
    1,249.36x = 1,238,315.43
  5. Step 5: Solve for x
    x = 1,238,315.43/1,249.36
  6. Step 6: Final answer
    x = 991.16

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Half scale
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Double scale
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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.