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Finding the Fourth Proportional to 1,479.20, 2,221.20 and 994.40

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Solution

The fourth proportional to 1,479.20, 2,221.20 and 994.40 is: 1,493.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,479.20 : 2,221.20 = 994.40 : x
  2. Step 2: Convert to fraction form
    1,479.20/2,221.20 = 994.40/x
  3. Step 3: Cross multiply
    1,479.20x = 2,221.20 × 994.40
  4. Step 4: Simplify right side
    1,479.20x = 2,208,761.28
  5. Step 5: Solve for x
    x = 2,208,761.28/1,479.20
  6. Step 6: Final answer
    x = 1,493.21

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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.