Home / 1,639.20-2,261.94-976.20

Finding the Fourth Proportional to 1,639.20, 2,261.94 and 976.20

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Solution

The fourth proportional to 1,639.20, 2,261.94 and 976.20 is: 1,347.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,639.20 : 2,261.94 = 976.20 : x
  2. Step 2: Convert to fraction form
    1,639.20/2,261.94 = 976.20/x
  3. Step 3: Cross multiply
    1,639.20x = 2,261.94 × 976.20
  4. Step 4: Simplify right side
    1,639.20x = 2,208,105.83
  5. Step 5: Solve for x
    x = 2,208,105.83/1,639.20
  6. Step 6: Final answer
    x = 1,347.06

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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.