Home / 2,111.40-2,913.87-1,215.44

Finding the Fourth Proportional to 2,111.40, 2,913.87 and 1,215.44

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Solution

The fourth proportional to 2,111.40, 2,913.87 and 1,215.44 is: 1,677.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,111.40 : 2,913.87 = 1,215.44 : x
  2. Step 2: Convert to fraction form
    2,111.40/2,913.87 = 1,215.44/x
  3. Step 3: Cross multiply
    2,111.40x = 2,913.87 × 1,215.44
  4. Step 4: Simplify right side
    2,111.40x = 3,541,619.58
  5. Step 5: Solve for x
    x = 3,541,619.58/2,111.40
  6. Step 6: Final answer
    x = 1,677.38

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1.5x scale

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.