Home / 20,816.20-31,205.34-7,659.40

Finding the Fourth Proportional to 20,816.20, 31,205.34 and 7,659.40

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Solution

The fourth proportional to 20,816.20, 31,205.34 and 7,659.40 is: 11,482.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,816.20 : 31,205.34 = 7,659.40 : x
  2. Step 2: Convert to fraction form
    20,816.20/31,205.34 = 7,659.40/x
  3. Step 3: Cross multiply
    20,816.20x = 31,205.34 × 7,659.40
  4. Step 4: Simplify right side
    20,816.20x = 239,014,181.20
  5. Step 5: Solve for x
    x = 239,014,181.20/20,816.20
  6. Step 6: Final answer
    x = 11,482.12

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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.