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Finding the Fourth Proportional to 12,605.85, 18,908.78 and 3,840.77

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Solution

The fourth proportional to 12,605.85, 18,908.78 and 3,840.77 is: 5,761.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,605.85 : 18,908.78 = 3,840.77 : x
  2. Step 2: Convert to fraction form
    12,605.85/18,908.78 = 3,840.77/x
  3. Step 3: Cross multiply
    12,605.85x = 18,908.78 × 3,840.77
  4. Step 4: Simplify right side
    12,605.85x = 72,624,274.96
  5. Step 5: Solve for x
    x = 72,624,274.96/12,605.85
  6. Step 6: Final answer
    x = 5,761.16

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Similar ratio
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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.