Home / 2,124.30-3,186.90-825.78

Finding the Fourth Proportional to 2,124.30, 3,186.90 and 825.78

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Solution

The fourth proportional to 2,124.30, 3,186.90 and 825.78 is: 1,238.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,124.30 : 3,186.90 = 825.78 : x
  2. Step 2: Convert to fraction form
    2,124.30/3,186.90 = 825.78/x
  3. Step 3: Cross multiply
    2,124.30x = 3,186.90 × 825.78
  4. Step 4: Simplify right side
    2,124.30x = 2,631,678.28
  5. Step 5: Solve for x
    x = 2,631,678.28/2,124.30
  6. Step 6: Final answer
    x = 1,238.84

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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.