Home / 2,145.40-3,218.10-1,313.80

Finding the Fourth Proportional to 2,145.40, 3,218.10 and 1,313.80

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Solution

The fourth proportional to 2,145.40, 3,218.10 and 1,313.80 is: 1,970.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,145.40 : 3,218.10 = 1,313.80 : x
  2. Step 2: Convert to fraction form
    2,145.40/3,218.10 = 1,313.80/x
  3. Step 3: Cross multiply
    2,145.40x = 3,218.10 × 1,313.80
  4. Step 4: Simplify right side
    2,145.40x = 4,227,939.78
  5. Step 5: Solve for x
    x = 4,227,939.78/2,145.40
  6. Step 6: Final answer
    x = 1,970.70

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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.