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Finding the Fourth Proportional to 1,420, 1,959.60 and 799

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Solution

The fourth proportional to 1,420, 1,959.60 and 799 is: 1,102.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420 : 1,959.60 = 799 : x
  2. Step 2: Convert to fraction form
    1,420/1,959.60 = 799/x
  3. Step 3: Cross multiply
    1,420x = 1,959.60 × 799
  4. Step 4: Simplify right side
    1,420x = 1,565,720.40
  5. Step 5: Solve for x
    x = 1,565,720.40/1,420
  6. Step 6: Final answer
    x = 1,102.62

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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.