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Finding the Fourth Proportional to 1,028.92, 1,420.16 and 636.36

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Solution

The fourth proportional to 1,028.92, 1,420.16 and 636.36 is: 878.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,028.92 : 1,420.16 = 636.36 : x
  2. Step 2: Convert to fraction form
    1,028.92/1,420.16 = 636.36/x
  3. Step 3: Cross multiply
    1,028.92x = 1,420.16 × 636.36
  4. Step 4: Simplify right side
    1,028.92x = 903,733.02
  5. Step 5: Solve for x
    x = 903,733.02/1,028.92
  6. Step 6: Final answer
    x = 878.33

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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.