Home / 1,389.44-1,917.48-768.56

Finding the Fourth Proportional to 1,389.44, 1,917.48 and 768.56

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Solution

The fourth proportional to 1,389.44, 1,917.48 and 768.56 is: 1,060.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.44 : 1,917.48 = 768.56 : x
  2. Step 2: Convert to fraction form
    1,389.44/1,917.48 = 768.56/x
  3. Step 3: Cross multiply
    1,389.44x = 1,917.48 × 768.56
  4. Step 4: Simplify right side
    1,389.44x = 1,473,698.43
  5. Step 5: Solve for x
    x = 1,473,698.43/1,389.44
  6. Step 6: Final answer
    x = 1,060.64

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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.