Home / 13,818.80-20,728.20-3,430.55

Finding the Fourth Proportional to 13,818.80, 20,728.20 and 3,430.55

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Solution

The fourth proportional to 13,818.80, 20,728.20 and 3,430.55 is: 5,145.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,818.80 : 20,728.20 = 3,430.55 : x
  2. Step 2: Convert to fraction form
    13,818.80/20,728.20 = 3,430.55/x
  3. Step 3: Cross multiply
    13,818.80x = 20,728.20 × 3,430.55
  4. Step 4: Simplify right side
    13,818.80x = 71,109,126.51
  5. Step 5: Solve for x
    x = 71,109,126.51/13,818.80
  6. Step 6: Final answer
    x = 5,145.83

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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.