Home / 1,680.45-2,518.59-1,311.39

Finding the Fourth Proportional to 1,680.45, 2,518.59 and 1,311.39

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Solution

The fourth proportional to 1,680.45, 2,518.59 and 1,311.39 is: 1,965.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,680.45 : 2,518.59 = 1,311.39 : x
  2. Step 2: Convert to fraction form
    1,680.45/2,518.59 = 1,311.39/x
  3. Step 3: Cross multiply
    1,680.45x = 2,518.59 × 1,311.39
  4. Step 4: Simplify right side
    1,680.45x = 3,302,858.66
  5. Step 5: Solve for x
    x = 3,302,858.66/1,680.45
  6. Step 6: Final answer
    x = 1,965.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.