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Finding the Fourth Proportional to 12,661.28, 18,993.36 and 4,868.72

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Solution

The fourth proportional to 12,661.28, 18,993.36 and 4,868.72 is: 7,303.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,661.28 : 18,993.36 = 4,868.72 : x
  2. Step 2: Convert to fraction form
    12,661.28/18,993.36 = 4,868.72/x
  3. Step 3: Cross multiply
    12,661.28x = 18,993.36 × 4,868.72
  4. Step 4: Simplify right side
    12,661.28x = 92,473,351.70
  5. Step 5: Solve for x
    x = 92,473,351.70/12,661.28
  6. Step 6: Final answer
    x = 7,303.63

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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.