Home / 2,142.08-3,213.20-1,325.60

Finding the Fourth Proportional to 2,142.08, 3,213.20 and 1,325.60

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Solution

The fourth proportional to 2,142.08, 3,213.20 and 1,325.60 is: 1,988.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,142.08 : 3,213.20 = 1,325.60 : x
  2. Step 2: Convert to fraction form
    2,142.08/3,213.20 = 1,325.60/x
  3. Step 3: Cross multiply
    2,142.08x = 3,213.20 × 1,325.60
  4. Step 4: Simplify right side
    2,142.08x = 4,259,417.92
  5. Step 5: Solve for x
    x = 4,259,417.92/2,142.08
  6. Step 6: Final answer
    x = 1,988.45

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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.