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Finding the Fourth Proportional to 1,392.03, 1,920.97 and 802.75

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Solution

The fourth proportional to 1,392.03, 1,920.97 and 802.75 is: 1,107.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.03 : 1,920.97 = 802.75 : x
  2. Step 2: Convert to fraction form
    1,392.03/1,920.97 = 802.75/x
  3. Step 3: Cross multiply
    1,392.03x = 1,920.97 × 802.75
  4. Step 4: Simplify right side
    1,392.03x = 1,542,058.67
  5. Step 5: Solve for x
    x = 1,542,058.67/1,392.03
  6. Step 6: Final answer
    x = 1,107.78

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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.