Home / 20,670.40-31,005.60-6,820.80

Finding the Fourth Proportional to 20,670.40, 31,005.60 and 6,820.80

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Solution

The fourth proportional to 20,670.40, 31,005.60 and 6,820.80 is: 10,231.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,670.40 : 31,005.60 = 6,820.80 : x
  2. Step 2: Convert to fraction form
    20,670.40/31,005.60 = 6,820.80/x
  3. Step 3: Cross multiply
    20,670.40x = 31,005.60 × 6,820.80
  4. Step 4: Simplify right side
    20,670.40x = 211,482,996.48
  5. Step 5: Solve for x
    x = 211,482,996.48/20,670.40
  6. Step 6: Final answer
    x = 10,231.20

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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.