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Finding the Fourth Proportional to 1,252.32, 1,728.21 and 721.26

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Solution

The fourth proportional to 1,252.32, 1,728.21 and 721.26 is: 995.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,252.32 : 1,728.21 = 721.26 : x
  2. Step 2: Convert to fraction form
    1,252.32/1,728.21 = 721.26/x
  3. Step 3: Cross multiply
    1,252.32x = 1,728.21 × 721.26
  4. Step 4: Simplify right side
    1,252.32x = 1,246,488.74
  5. Step 5: Solve for x
    x = 1,246,488.74/1,252.32
  6. Step 6: Final answer
    x = 995.34

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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.