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Finding the Fourth Proportional to 1,426.40, 2,142.80 and 994.40

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Solution

The fourth proportional to 1,426.40, 2,142.80 and 994.40 is: 1,493.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,426.40 : 2,142.80 = 994.40 : x
  2. Step 2: Convert to fraction form
    1,426.40/2,142.80 = 994.40/x
  3. Step 3: Cross multiply
    1,426.40x = 2,142.80 × 994.40
  4. Step 4: Simplify right side
    1,426.40x = 2,130,800.32
  5. Step 5: Solve for x
    x = 2,130,800.32/1,426.40
  6. Step 6: Final answer
    x = 1,493.83

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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.