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Finding the Fourth Proportional to 1,080.28, 1,490.82 and 608.20

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Solution

The fourth proportional to 1,080.28, 1,490.82 and 608.20 is: 839.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.28 : 1,490.82 = 608.20 : x
  2. Step 2: Convert to fraction form
    1,080.28/1,490.82 = 608.20/x
  3. Step 3: Cross multiply
    1,080.28x = 1,490.82 × 608.20
  4. Step 4: Simplify right side
    1,080.28x = 906,716.72
  5. Step 5: Solve for x
    x = 906,716.72/1,080.28
  6. Step 6: Final answer
    x = 839.33

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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.