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Finding the Fourth Proportional to 8,739.28, 12,063.90 and 8,281.23

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Solution

The fourth proportional to 8,739.28, 12,063.90 and 8,281.23 is: 11,431.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,739.28 : 12,063.90 = 8,281.23 : x
  2. Step 2: Convert to fraction form
    8,739.28/12,063.90 = 8,281.23/x
  3. Step 3: Cross multiply
    8,739.28x = 12,063.90 × 8,281.23
  4. Step 4: Simplify right side
    8,739.28x = 99,903,930.60
  5. Step 5: Solve for x
    x = 99,903,930.60/8,739.28
  6. Step 6: Final answer
    x = 11,431.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.