Home / 1,621.85-2,236.79-999.77

Finding the Fourth Proportional to 1,621.85, 2,236.79 and 999.77

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Solution

The fourth proportional to 1,621.85, 2,236.79 and 999.77 is: 1,378.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,621.85 : 2,236.79 = 999.77 : x
  2. Step 2: Convert to fraction form
    1,621.85/2,236.79 = 999.77/x
  3. Step 3: Cross multiply
    1,621.85x = 2,236.79 × 999.77
  4. Step 4: Simplify right side
    1,621.85x = 2,236,266.85
  5. Step 5: Solve for x
    x = 2,236,266.85/1,621.85
  6. Step 6: Final answer
    x = 1,378.84

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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.