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Finding the Fourth Proportional to 1,247.46, 1,721.46 and 723.48

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Solution

The fourth proportional to 1,247.46, 1,721.46 and 723.48 is: 998.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.46 : 1,721.46 = 723.48 : x
  2. Step 2: Convert to fraction form
    1,247.46/1,721.46 = 723.48/x
  3. Step 3: Cross multiply
    1,247.46x = 1,721.46 × 723.48
  4. Step 4: Simplify right side
    1,247.46x = 1,245,441.88
  5. Step 5: Solve for x
    x = 1,245,441.88/1,247.46
  6. Step 6: Final answer
    x = 998.38

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Half 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.