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Finding the Fourth Proportional to 12,672.40, 19,008.60 and 3,438.40

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Solution

The fourth proportional to 12,672.40, 19,008.60 and 3,438.40 is: 5,157.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,672.40 : 19,008.60 = 3,438.40 : x
  2. Step 2: Convert to fraction form
    12,672.40/19,008.60 = 3,438.40/x
  3. Step 3: Cross multiply
    12,672.40x = 19,008.60 × 3,438.40
  4. Step 4: Simplify right side
    12,672.40x = 65,359,170.24
  5. Step 5: Solve for x
    x = 65,359,170.24/12,672.40
  6. Step 6: Final answer
    x = 5,157.60

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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.