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Finding the Fourth Proportional to 1,393.26, 1,920.04 and 999.60

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Solution

The fourth proportional to 1,393.26, 1,920.04 and 999.60 is: 1,377.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.26 : 1,920.04 = 999.60 : x
  2. Step 2: Convert to fraction form
    1,393.26/1,920.04 = 999.60/x
  3. Step 3: Cross multiply
    1,393.26x = 1,920.04 × 999.60
  4. Step 4: Simplify right side
    1,393.26x = 1,919,271.98
  5. Step 5: Solve for x
    x = 1,919,271.98/1,393.26
  6. Step 6: Final answer
    x = 1,377.54

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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.