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Finding the Fourth Proportional to 1,245.25, 1,718.54 and 721.32

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Solution

The fourth proportional to 1,245.25, 1,718.54 and 721.32 is: 995.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.25 : 1,718.54 = 721.32 : x
  2. Step 2: Convert to fraction form
    1,245.25/1,718.54 = 721.32/x
  3. Step 3: Cross multiply
    1,245.25x = 1,718.54 × 721.32
  4. Step 4: Simplify right side
    1,245.25x = 1,239,617.27
  5. Step 5: Solve for x
    x = 1,239,617.27/1,245.25
  6. Step 6: Final answer
    x = 995.48

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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.