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Finding the Fourth Proportional to 12,189.64, 16,821.72 and 6,600.64

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Solution

The fourth proportional to 12,189.64, 16,821.72 and 6,600.64 is: 9,108.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,189.64 : 16,821.72 = 6,600.64 : x
  2. Step 2: Convert to fraction form
    12,189.64/16,821.72 = 6,600.64/x
  3. Step 3: Cross multiply
    12,189.64x = 16,821.72 × 6,600.64
  4. Step 4: Simplify right side
    12,189.64x = 111,034,117.90
  5. Step 5: Solve for x
    x = 111,034,117.90/12,189.64
  6. Step 6: Final answer
    x = 9,108.89

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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.