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Finding the Fourth Proportional to 9,129.80, 12,820.60 and 9,129.80

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Solution

The fourth proportional to 9,129.80, 12,820.60 and 9,129.80 is: 12,820.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,129.80 : 12,820.60 = 9,129.80 : x
  2. Step 2: Convert to fraction form
    9,129.80/12,820.60 = 9,129.80/x
  3. Step 3: Cross multiply
    9,129.80x = 12,820.60 × 9,129.80
  4. Step 4: Simplify right side
    9,129.80x = 117,049,513.88
  5. Step 5: Solve for x
    x = 117,049,513.88/9,129.80
  6. Step 6: Final answer
    x = 12,820.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.