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Finding the Fourth Proportional to 1,399.80, 2,099.70 and 851.70

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Solution

The fourth proportional to 1,399.80, 2,099.70 and 851.70 is: 1,277.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,399.80 : 2,099.70 = 851.70 : x
  2. Step 2: Convert to fraction form
    1,399.80/2,099.70 = 851.70/x
  3. Step 3: Cross multiply
    1,399.80x = 2,099.70 × 851.70
  4. Step 4: Simplify right side
    1,399.80x = 1,788,314.49
  5. Step 5: Solve for x
    x = 1,788,314.49/1,399.80
  6. Step 6: Final answer
    x = 1,277.55

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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.