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Finding the Fourth Proportional to 1,392.26, 1,920.65 and 894.65

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Solution

The fourth proportional to 1,392.26, 1,920.65 and 894.65 is: 1,234.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.26 : 1,920.65 = 894.65 : x
  2. Step 2: Convert to fraction form
    1,392.26/1,920.65 = 894.65/x
  3. Step 3: Cross multiply
    1,392.26x = 1,920.65 × 894.65
  4. Step 4: Simplify right side
    1,392.26x = 1,718,295.45
  5. Step 5: Solve for x
    x = 1,718,295.45/1,392.26
  6. Step 6: Final answer
    x = 1,234.18

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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.