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Finding the Fourth Proportional to 1,391.93, 1,920.90 and 802.46

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Solution

The fourth proportional to 1,391.93, 1,920.90 and 802.46 is: 1,107.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.93 : 1,920.90 = 802.46 : x
  2. Step 2: Convert to fraction form
    1,391.93/1,920.90 = 802.46/x
  3. Step 3: Cross multiply
    1,391.93x = 1,920.90 × 802.46
  4. Step 4: Simplify right side
    1,391.93x = 1,541,445.41
  5. Step 5: Solve for x
    x = 1,541,445.41/1,391.93
  6. Step 6: Final answer
    x = 1,107.42

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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.