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Finding the Fourth Proportional to 8,459.99, 12,690.83 and 2,912.60

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Solution

The fourth proportional to 8,459.99, 12,690.83 and 2,912.60 is: 4,369.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,459.99 : 12,690.83 = 2,912.60 : x
  2. Step 2: Convert to fraction form
    8,459.99/12,690.83 = 2,912.60/x
  3. Step 3: Cross multiply
    8,459.99x = 12,690.83 × 2,912.60
  4. Step 4: Simplify right side
    8,459.99x = 36,963,311.46
  5. Step 5: Solve for x
    x = 36,963,311.46/8,459.99
  6. Step 6: Final answer
    x = 4,369.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.