Home / 20,309.12-30,458.78-6,980.56

Finding the Fourth Proportional to 20,309.12, 30,458.78 and 6,980.56

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Solution

The fourth proportional to 20,309.12, 30,458.78 and 6,980.56 is: 10,469.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,309.12 : 30,458.78 = 6,980.56 : x
  2. Step 2: Convert to fraction form
    20,309.12/30,458.78 = 6,980.56/x
  3. Step 3: Cross multiply
    20,309.12x = 30,458.78 × 6,980.56
  4. Step 4: Simplify right side
    20,309.12x = 212,619,341.32
  5. Step 5: Solve for x
    x = 212,619,341.32/20,309.12
  6. Step 6: Final answer
    x = 10,469.16

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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.