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Finding the Fourth Proportional to 1,069.75, 1,476.39 and 721.18

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Solution

The fourth proportional to 1,069.75, 1,476.39 and 721.18 is: 995.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,069.75 : 1,476.39 = 721.18 : x
  2. Step 2: Convert to fraction form
    1,069.75/1,476.39 = 721.18/x
  3. Step 3: Cross multiply
    1,069.75x = 1,476.39 × 721.18
  4. Step 4: Simplify right side
    1,069.75x = 1,064,742.94
  5. Step 5: Solve for x
    x = 1,064,742.94/1,069.75
  6. Step 6: Final answer
    x = 995.32

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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.