Home / 1,378.27-1,904.07-1,115.83

Finding the Fourth Proportional to 1,378.27, 1,904.07 and 1,115.83

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Solution

The fourth proportional to 1,378.27, 1,904.07 and 1,115.83 is: 1,541.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.27 : 1,904.07 = 1,115.83 : x
  2. Step 2: Convert to fraction form
    1,378.27/1,904.07 = 1,115.83/x
  3. Step 3: Cross multiply
    1,378.27x = 1,904.07 × 1,115.83
  4. Step 4: Simplify right side
    1,378.27x = 2,124,618.43
  5. Step 5: Solve for x
    x = 2,124,618.43/1,378.27
  6. Step 6: Final answer
    x = 1,541.51

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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.