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Finding the Fourth Proportional to 1,391.87, 1,920.84 and 802.60

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Solution

The fourth proportional to 1,391.87, 1,920.84 and 802.60 is: 1,107.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.87 : 1,920.84 = 802.60 : x
  2. Step 2: Convert to fraction form
    1,391.87/1,920.84 = 802.60/x
  3. Step 3: Cross multiply
    1,391.87x = 1,920.84 × 802.60
  4. Step 4: Simplify right side
    1,391.87x = 1,541,666.18
  5. Step 5: Solve for x
    x = 1,541,666.18/1,391.87
  6. Step 6: Final answer
    x = 1,107.62

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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.