Home / 2,151.20-3,226.64-690.30

Finding the Fourth Proportional to 2,151.20, 3,226.64 and 690.30

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Solution

The fourth proportional to 2,151.20, 3,226.64 and 690.30 is: 1,035.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,151.20 : 3,226.64 = 690.30 : x
  2. Step 2: Convert to fraction form
    2,151.20/3,226.64 = 690.30/x
  3. Step 3: Cross multiply
    2,151.20x = 3,226.64 × 690.30
  4. Step 4: Simplify right side
    2,151.20x = 2,227,346.14
  5. Step 5: Solve for x
    x = 2,227,346.14/2,151.20
  6. Step 6: Final answer
    x = 1,035.40

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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.