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Finding the Fourth Proportional to 8,805.68, 12,147.21 and 7,128.98

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Solution

The fourth proportional to 8,805.68, 12,147.21 and 7,128.98 is: 9,834.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,805.68 : 12,147.21 = 7,128.98 : x
  2. Step 2: Convert to fraction form
    8,805.68/12,147.21 = 7,128.98/x
  3. Step 3: Cross multiply
    8,805.68x = 12,147.21 × 7,128.98
  4. Step 4: Simplify right side
    8,805.68x = 86,597,217.15
  5. Step 5: Solve for x
    x = 86,597,217.15/8,805.68
  6. Step 6: Final answer
    x = 9,834.25

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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.