Home / 1,311.14-1,808.73-1,217.35

Finding the Fourth Proportional to 1,311.14, 1,808.73 and 1,217.35

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Solution

The fourth proportional to 1,311.14, 1,808.73 and 1,217.35 is: 1,679.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.14 : 1,808.73 = 1,217.35 : x
  2. Step 2: Convert to fraction form
    1,311.14/1,808.73 = 1,217.35/x
  3. Step 3: Cross multiply
    1,311.14x = 1,808.73 × 1,217.35
  4. Step 4: Simplify right side
    1,311.14x = 2,201,859.73
  5. Step 5: Solve for x
    x = 2,201,859.73/1,311.14
  6. Step 6: Final answer
    x = 1,679.34

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1.5x scale

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.