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Finding the Fourth Proportional to 19,005.68, 28,510.78 and 7,919.88

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Solution

The fourth proportional to 19,005.68, 28,510.78 and 7,919.88 is: 11,880.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,005.68 : 28,510.78 = 7,919.88 : x
  2. Step 2: Convert to fraction form
    19,005.68/28,510.78 = 7,919.88/x
  3. Step 3: Cross multiply
    19,005.68x = 28,510.78 × 7,919.88
  4. Step 4: Simplify right side
    19,005.68x = 225,801,956.31
  5. Step 5: Solve for x
    x = 225,801,956.31/19,005.68
  6. Step 6: Final answer
    x = 11,880.76

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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.