Home / 1,380.35-1,904.49-1,311.09

Finding the Fourth Proportional to 1,380.35, 1,904.49 and 1,311.09

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Solution

The fourth proportional to 1,380.35, 1,904.49 and 1,311.09 is: 1,808.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.35 : 1,904.49 = 1,311.09 : x
  2. Step 2: Convert to fraction form
    1,380.35/1,904.49 = 1,311.09/x
  3. Step 3: Cross multiply
    1,380.35x = 1,904.49 × 1,311.09
  4. Step 4: Simplify right side
    1,380.35x = 2,496,957.79
  5. Step 5: Solve for x
    x = 2,496,957.79/1,380.35
  6. Step 6: Final answer
    x = 1,808.94

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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.