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Finding the Fourth Proportional to 1,028.28, 1,418.62 and 634.62

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Solution

The fourth proportional to 1,028.28, 1,418.62 and 634.62 is: 875.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,028.28 : 1,418.62 = 634.62 : x
  2. Step 2: Convert to fraction form
    1,028.28/1,418.62 = 634.62/x
  3. Step 3: Cross multiply
    1,028.28x = 1,418.62 × 634.62
  4. Step 4: Simplify right side
    1,028.28x = 900,274.36
  5. Step 5: Solve for x
    x = 900,274.36/1,028.28
  6. Step 6: Final answer
    x = 875.52

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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.