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Finding the Fourth Proportional to 984.49, 1,479.44 and 920.28

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Solution

The fourth proportional to 984.49, 1,479.44 and 920.28 is: 1,382.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.49 : 1,479.44 = 920.28 : x
  2. Step 2: Convert to fraction form
    984.49/1,479.44 = 920.28/x
  3. Step 3: Cross multiply
    984.49x = 1,479.44 × 920.28
  4. Step 4: Simplify right side
    984.49x = 1,361,499.04
  5. Step 5: Solve for x
    x = 1,361,499.04/984.49
  6. Step 6: Final answer
    x = 1,382.95

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.