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Finding the Fourth Proportional to 12,015.72, 18,014.04 and 7,881.48

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Solution

The fourth proportional to 12,015.72, 18,014.04 and 7,881.48 is: 11,815.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,015.72 : 18,014.04 = 7,881.48 : x
  2. Step 2: Convert to fraction form
    12,015.72/18,014.04 = 7,881.48/x
  3. Step 3: Cross multiply
    12,015.72x = 18,014.04 × 7,881.48
  4. Step 4: Simplify right side
    12,015.72x = 141,977,295.98
  5. Step 5: Solve for x
    x = 141,977,295.98/12,015.72
  6. Step 6: Final answer
    x = 11,815.96

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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.