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Finding the Fourth Proportional to 6,912.40, 10,368.60 and 6,447.70

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Solution

The fourth proportional to 6,912.40, 10,368.60 and 6,447.70 is: 9,671.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,912.40 : 10,368.60 = 6,447.70 : x
  2. Step 2: Convert to fraction form
    6,912.40/10,368.60 = 6,447.70/x
  3. Step 3: Cross multiply
    6,912.40x = 10,368.60 × 6,447.70
  4. Step 4: Simplify right side
    6,912.40x = 66,853,622.22
  5. Step 5: Solve for x
    x = 66,853,622.22/6,912.40
  6. Step 6: Final answer
    x = 9,671.55

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Similar ratio
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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.