Home / 20,500.08-30,680.40-13,109.60

Finding the Fourth Proportional to 20,500.08, 30,680.40 and 13,109.60

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Solution

The fourth proportional to 20,500.08, 30,680.40 and 13,109.60 is: 19,619.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,500.08 : 30,680.40 = 13,109.60 : x
  2. Step 2: Convert to fraction form
    20,500.08/30,680.40 = 13,109.60/x
  3. Step 3: Cross multiply
    20,500.08x = 30,680.40 × 13,109.60
  4. Step 4: Simplify right side
    20,500.08x = 402,207,771.84
  5. Step 5: Solve for x
    x = 402,207,771.84/20,500.08
  6. Step 6: Final answer
    x = 19,619.81

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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.