Home / 2,145.12-3,216.51-683.88

Finding the Fourth Proportional to 2,145.12, 3,216.51 and 683.88

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Solution

The fourth proportional to 2,145.12, 3,216.51 and 683.88 is: 1,025.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,145.12 : 3,216.51 = 683.88 : x
  2. Step 2: Convert to fraction form
    2,145.12/3,216.51 = 683.88/x
  3. Step 3: Cross multiply
    2,145.12x = 3,216.51 × 683.88
  4. Step 4: Simplify right side
    2,145.12x = 2,199,706.86
  5. Step 5: Solve for x
    x = 2,199,706.86/2,145.12
  6. Step 6: Final answer
    x = 1,025.45

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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.