Home / 13,139.20-19,687.20-12,361.60

Finding the Fourth Proportional to 13,139.20, 19,687.20 and 12,361.60

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Solution

The fourth proportional to 13,139.20, 19,687.20 and 12,361.60 is: 18,522.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,139.20 : 19,687.20 = 12,361.60 : x
  2. Step 2: Convert to fraction form
    13,139.20/19,687.20 = 12,361.60/x
  3. Step 3: Cross multiply
    13,139.20x = 19,687.20 × 12,361.60
  4. Step 4: Simplify right side
    13,139.20x = 243,365,291.52
  5. Step 5: Solve for x
    x = 243,365,291.52/13,139.20
  6. Step 6: Final answer
    x = 18,522.08

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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.