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Finding the Fourth Proportional to 8,720.84, 12,021.12 and 7,134.05

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Solution

The fourth proportional to 8,720.84, 12,021.12 and 7,134.05 is: 9,833.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,720.84 : 12,021.12 = 7,134.05 : x
  2. Step 2: Convert to fraction form
    8,720.84/12,021.12 = 7,134.05/x
  3. Step 3: Cross multiply
    8,720.84x = 12,021.12 × 7,134.05
  4. Step 4: Simplify right side
    8,720.84x = 85,759,211.03
  5. Step 5: Solve for x
    x = 85,759,211.03/8,720.84
  6. Step 6: Final answer
    x = 9,833.83

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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.