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Finding the Fourth Proportional to 1,391.63, 1,920.45 and 802.22

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Solution

The fourth proportional to 1,391.63, 1,920.45 and 802.22 is: 1,107.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.63 : 1,920.45 = 802.22 : x
  2. Step 2: Convert to fraction form
    1,391.63/1,920.45 = 802.22/x
  3. Step 3: Cross multiply
    1,391.63x = 1,920.45 × 802.22
  4. Step 4: Simplify right side
    1,391.63x = 1,540,623.40
  5. Step 5: Solve for x
    x = 1,540,623.40/1,391.63
  6. Step 6: Final answer
    x = 1,107.06

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1.5x scale

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.