Home / 1,311.17-1,806.65-1,205.06

Finding the Fourth Proportional to 1,311.17, 1,806.65 and 1,205.06

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Solution

The fourth proportional to 1,311.17, 1,806.65 and 1,205.06 is: 1,660.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.17 : 1,806.65 = 1,205.06 : x
  2. Step 2: Convert to fraction form
    1,311.17/1,806.65 = 1,205.06/x
  3. Step 3: Cross multiply
    1,311.17x = 1,806.65 × 1,205.06
  4. Step 4: Simplify right side
    1,311.17x = 2,177,106.59
  5. Step 5: Solve for x
    x = 2,177,106.59/1,311.17
  6. Step 6: Final answer
    x = 1,660.44

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.