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Finding the Fourth Proportional to 1,252.52, 1,728.34 and 721.48

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Solution

The fourth proportional to 1,252.52, 1,728.34 and 721.48 is: 995.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,252.52 : 1,728.34 = 721.48 : x
  2. Step 2: Convert to fraction form
    1,252.52/1,728.34 = 721.48/x
  3. Step 3: Cross multiply
    1,252.52x = 1,728.34 × 721.48
  4. Step 4: Simplify right side
    1,252.52x = 1,246,962.74
  5. Step 5: Solve for x
    x = 1,246,962.74/1,252.52
  6. Step 6: Final answer
    x = 995.56

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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.