Home / 1,278.20-1,914.46-1,247.16

Finding the Fourth Proportional to 1,278.20, 1,914.46 and 1,247.16

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Solution

The fourth proportional to 1,278.20, 1,914.46 and 1,247.16 is: 1,867.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.20 : 1,914.46 = 1,247.16 : x
  2. Step 2: Convert to fraction form
    1,278.20/1,914.46 = 1,247.16/x
  3. Step 3: Cross multiply
    1,278.20x = 1,914.46 × 1,247.16
  4. Step 4: Simplify right side
    1,278.20x = 2,387,637.93
  5. Step 5: Solve for x
    x = 2,387,637.93/1,278.20
  6. Step 6: Final answer
    x = 1,867.97

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1.5x scale

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.