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Finding the Fourth Proportional to 12,756.64, 19,131.12 and 3,990.88

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Solution

The fourth proportional to 12,756.64, 19,131.12 and 3,990.88 is: 5,985.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,756.64 : 19,131.12 = 3,990.88 : x
  2. Step 2: Convert to fraction form
    12,756.64/19,131.12 = 3,990.88/x
  3. Step 3: Cross multiply
    12,756.64x = 19,131.12 × 3,990.88
  4. Step 4: Simplify right side
    12,756.64x = 76,350,004.19
  5. Step 5: Solve for x
    x = 76,350,004.19/12,756.64
  6. Step 6: Final answer
    x = 5,985.12

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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.