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Finding the Fourth Proportional to 12,860.73, 19,271.13 and 8,919.67

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Solution

The fourth proportional to 12,860.73, 19,271.13 and 8,919.67 is: 13,365.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,860.73 : 19,271.13 = 8,919.67 : x
  2. Step 2: Convert to fraction form
    12,860.73/19,271.13 = 8,919.67/x
  3. Step 3: Cross multiply
    12,860.73x = 19,271.13 × 8,919.67
  4. Step 4: Simplify right side
    12,860.73x = 171,892,120.13
  5. Step 5: Solve for x
    x = 171,892,120.13/12,860.73
  6. Step 6: Final answer
    x = 13,365.66

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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.