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Finding the Fourth Proportional to 12,480.40, 17,222.79 and 6,815.67

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Solution

The fourth proportional to 12,480.40, 17,222.79 and 6,815.67 is: 9,405.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,480.40 : 17,222.79 = 6,815.67 : x
  2. Step 2: Convert to fraction form
    12,480.40/17,222.79 = 6,815.67/x
  3. Step 3: Cross multiply
    12,480.40x = 17,222.79 × 6,815.67
  4. Step 4: Simplify right side
    12,480.40x = 117,384,853.12
  5. Step 5: Solve for x
    x = 117,384,853.12/12,480.40
  6. Step 6: Final answer
    x = 9,405.54

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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.