Home / 1,920.14-2,649.78-1,221.50

Finding the Fourth Proportional to 1,920.14, 2,649.78 and 1,221.50

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Solution

The fourth proportional to 1,920.14, 2,649.78 and 1,221.50 is: 1,685.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,920.14 : 2,649.78 = 1,221.50 : x
  2. Step 2: Convert to fraction form
    1,920.14/2,649.78 = 1,221.50/x
  3. Step 3: Cross multiply
    1,920.14x = 2,649.78 × 1,221.50
  4. Step 4: Simplify right side
    1,920.14x = 3,236,706.27
  5. Step 5: Solve for x
    x = 3,236,706.27/1,920.14
  6. Step 6: Final answer
    x = 1,685.66

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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.