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Finding the Fourth Proportional to 18,919.65, 28,379.48 and 8,787.02

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Solution

The fourth proportional to 18,919.65, 28,379.48 and 8,787.02 is: 13,180.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,919.65 : 28,379.48 = 8,787.02 : x
  2. Step 2: Convert to fraction form
    18,919.65/28,379.48 = 8,787.02/x
  3. Step 3: Cross multiply
    18,919.65x = 28,379.48 × 8,787.02
  4. Step 4: Simplify right side
    18,919.65x = 249,370,872.52
  5. Step 5: Solve for x
    x = 249,370,872.52/18,919.65
  6. Step 6: Final answer
    x = 13,180.52

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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.