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Finding the Fourth Proportional to 1,028.88, 1,420.41 and 693.27

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Solution

The fourth proportional to 1,028.88, 1,420.41 and 693.27 is: 957.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,028.88 : 1,420.41 = 693.27 : x
  2. Step 2: Convert to fraction form
    1,028.88/1,420.41 = 693.27/x
  3. Step 3: Cross multiply
    1,028.88x = 1,420.41 × 693.27
  4. Step 4: Simplify right side
    1,028.88x = 984,727.64
  5. Step 5: Solve for x
    x = 984,727.64/1,028.88
  6. Step 6: Final answer
    x = 957.09

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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.