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Finding the Fourth Proportional to 1,249.50, 1,724.36 and 718.55

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Solution

The fourth proportional to 1,249.50, 1,724.36 and 718.55 is: 991.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,249.50 : 1,724.36 = 718.55 : x
  2. Step 2: Convert to fraction form
    1,249.50/1,724.36 = 718.55/x
  3. Step 3: Cross multiply
    1,249.50x = 1,724.36 × 718.55
  4. Step 4: Simplify right side
    1,249.50x = 1,239,038.88
  5. Step 5: Solve for x
    x = 1,239,038.88/1,249.50
  6. Step 6: Final answer
    x = 991.63

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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.