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Finding the Fourth Proportional to 2,839.60, 4,259.41 and 990.70

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Solution

The fourth proportional to 2,839.60, 4,259.41 and 990.70 is: 1,486.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,839.60 : 4,259.41 = 990.70 : x
  2. Step 2: Convert to fraction form
    2,839.60/4,259.41 = 990.70/x
  3. Step 3: Cross multiply
    2,839.60x = 4,259.41 × 990.70
  4. Step 4: Simplify right side
    2,839.60x = 4,219,797.49
  5. Step 5: Solve for x
    x = 4,219,797.49/2,839.60
  6. Step 6: Final answer
    x = 1,486.06

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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.