Home / 1,928.34-2,890.43-1,261.45

Finding the Fourth Proportional to 1,928.34, 2,890.43 and 1,261.45

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Solution

The fourth proportional to 1,928.34, 2,890.43 and 1,261.45 is: 1,890.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,928.34 : 2,890.43 = 1,261.45 : x
  2. Step 2: Convert to fraction form
    1,928.34/2,890.43 = 1,261.45/x
  3. Step 3: Cross multiply
    1,928.34x = 2,890.43 × 1,261.45
  4. Step 4: Simplify right side
    1,928.34x = 3,646,132.92
  5. Step 5: Solve for x
    x = 3,646,132.92/1,928.34
  6. Step 6: Final answer
    x = 1,890.81

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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.