Home / 12,940.40-19,410.60-5,145.20

Finding the Fourth Proportional to 12,940.40, 19,410.60 and 5,145.20

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Solution

The fourth proportional to 12,940.40, 19,410.60 and 5,145.20 is: 7,717.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,940.40 : 19,410.60 = 5,145.20 : x
  2. Step 2: Convert to fraction form
    12,940.40/19,410.60 = 5,145.20/x
  3. Step 3: Cross multiply
    12,940.40x = 19,410.60 × 5,145.20
  4. Step 4: Simplify right side
    12,940.40x = 99,871,419.12
  5. Step 5: Solve for x
    x = 99,871,419.12/12,940.40
  6. Step 6: Final answer
    x = 7,717.80

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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.