Home / 2,145.40-3,214.64-1,218.20

Finding the Fourth Proportional to 2,145.40, 3,214.64 and 1,218.20

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Solution

The fourth proportional to 2,145.40, 3,214.64 and 1,218.20 is: 1,825.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,145.40 : 3,214.64 = 1,218.20 : x
  2. Step 2: Convert to fraction form
    2,145.40/3,214.64 = 1,218.20/x
  3. Step 3: Cross multiply
    2,145.40x = 3,214.64 × 1,218.20
  4. Step 4: Simplify right side
    2,145.40x = 3,916,074.45
  5. Step 5: Solve for x
    x = 3,916,074.45/2,145.40
  6. Step 6: Final answer
    x = 1,825.34

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1.5x scale

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.