Home / 13,419.20-20,104.80-6,478.40

Finding the Fourth Proportional to 13,419.20, 20,104.80 and 6,478.40

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Solution

The fourth proportional to 13,419.20, 20,104.80 and 6,478.40 is: 9,706.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,419.20 : 20,104.80 = 6,478.40 : x
  2. Step 2: Convert to fraction form
    13,419.20/20,104.80 = 6,478.40/x
  3. Step 3: Cross multiply
    13,419.20x = 20,104.80 × 6,478.40
  4. Step 4: Simplify right side
    13,419.20x = 130,246,936.32
  5. Step 5: Solve for x
    x = 130,246,936.32/13,419.20
  6. Step 6: Final answer
    x = 9,706.01

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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.