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Finding the Fourth Proportional to 1,392.34, 1,921.38 and 802.90

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Solution

The fourth proportional to 1,392.34, 1,921.38 and 802.90 is: 1,107.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.34 : 1,921.38 = 802.90 : x
  2. Step 2: Convert to fraction form
    1,392.34/1,921.38 = 802.90/x
  3. Step 3: Cross multiply
    1,392.34x = 1,921.38 × 802.90
  4. Step 4: Simplify right side
    1,392.34x = 1,542,676.00
  5. Step 5: Solve for x
    x = 1,542,676.00/1,392.34
  6. Step 6: Final answer
    x = 1,107.97

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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.