Home / 1,286.35-1,931.70-1,220.59

Finding the Fourth Proportional to 1,286.35, 1,931.70 and 1,220.59

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Solution

The fourth proportional to 1,286.35, 1,931.70 and 1,220.59 is: 1,832.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.35 : 1,931.70 = 1,220.59 : x
  2. Step 2: Convert to fraction form
    1,286.35/1,931.70 = 1,220.59/x
  3. Step 3: Cross multiply
    1,286.35x = 1,931.70 × 1,220.59
  4. Step 4: Simplify right side
    1,286.35x = 2,357,813.70
  5. Step 5: Solve for x
    x = 2,357,813.70/1,286.35
  6. Step 6: Final answer
    x = 1,832.95

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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.