Home / 2,857.02-4,286.19-909.21

Finding the Fourth Proportional to 2,857.02, 4,286.19 and 909.21

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Solution

The fourth proportional to 2,857.02, 4,286.19 and 909.21 is: 1,364.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,857.02 : 4,286.19 = 909.21 : x
  2. Step 2: Convert to fraction form
    2,857.02/4,286.19 = 909.21/x
  3. Step 3: Cross multiply
    2,857.02x = 4,286.19 × 909.21
  4. Step 4: Simplify right side
    2,857.02x = 3,897,046.81
  5. Step 5: Solve for x
    x = 3,897,046.81/2,857.02
  6. Step 6: Final answer
    x = 1,364.03

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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.