Home / 1,392.32-2,085.68-928.56

Finding the Fourth Proportional to 1,392.32, 2,085.68 and 928.56

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Solution

The fourth proportional to 1,392.32, 2,085.68 and 928.56 is: 1,390.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.32 : 2,085.68 = 928.56 : x
  2. Step 2: Convert to fraction form
    1,392.32/2,085.68 = 928.56/x
  3. Step 3: Cross multiply
    1,392.32x = 2,085.68 × 928.56
  4. Step 4: Simplify right side
    1,392.32x = 1,936,679.02
  5. Step 5: Solve for x
    x = 1,936,679.02/1,392.32
  6. Step 6: Final answer
    x = 1,390.97

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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.