Home / 13,420.20-20,106.30-6,479.40

Finding the Fourth Proportional to 13,420.20, 20,106.30 and 6,479.40

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Solution

The fourth proportional to 13,420.20, 20,106.30 and 6,479.40 is: 9,707.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,420.20 : 20,106.30 = 6,479.40 : x
  2. Step 2: Convert to fraction form
    13,420.20/20,106.30 = 6,479.40/x
  3. Step 3: Cross multiply
    13,420.20x = 20,106.30 × 6,479.40
  4. Step 4: Simplify right side
    13,420.20x = 130,276,760.22
  5. Step 5: Solve for x
    x = 130,276,760.22/13,420.20
  6. Step 6: Final answer
    x = 9,707.51

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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.