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Finding the Fourth Proportional to 1,028.39, 1,419.44 and 635.18

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Solution

The fourth proportional to 1,028.39, 1,419.44 and 635.18 is: 876.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,028.39 : 1,419.44 = 635.18 : x
  2. Step 2: Convert to fraction form
    1,028.39/1,419.44 = 635.18/x
  3. Step 3: Cross multiply
    1,028.39x = 1,419.44 × 635.18
  4. Step 4: Simplify right side
    1,028.39x = 901,599.90
  5. Step 5: Solve for x
    x = 901,599.90/1,028.39
  6. Step 6: Final answer
    x = 876.71

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Double 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.