Home / 6,814.40-10,221.60-3,120.80

Finding the Fourth Proportional to 6,814.40, 10,221.60 and 3,120.80

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Solution

The fourth proportional to 6,814.40, 10,221.60 and 3,120.80 is: 4,681.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,814.40 : 10,221.60 = 3,120.80 : x
  2. Step 2: Convert to fraction form
    6,814.40/10,221.60 = 3,120.80/x
  3. Step 3: Cross multiply
    6,814.40x = 10,221.60 × 3,120.80
  4. Step 4: Simplify right side
    6,814.40x = 31,899,569.28
  5. Step 5: Solve for x
    x = 31,899,569.28/6,814.40
  6. Step 6: Final answer
    x = 4,681.20

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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.