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Finding the Fourth Proportional to 9,189.79, 12,739.84 and 8,690.83

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Solution

The fourth proportional to 9,189.79, 12,739.84 and 8,690.83 is: 12,048.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,189.79 : 12,739.84 = 8,690.83 : x
  2. Step 2: Convert to fraction form
    9,189.79/12,739.84 = 8,690.83/x
  3. Step 3: Cross multiply
    9,189.79x = 12,739.84 × 8,690.83
  4. Step 4: Simplify right side
    9,189.79x = 110,719,783.67
  5. Step 5: Solve for x
    x = 110,719,783.67/9,189.79
  6. Step 6: Final answer
    x = 12,048.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.