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Finding the Fourth Proportional to 18,639.86, 27,966.16 and 8,779.64

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Solution

The fourth proportional to 18,639.86, 27,966.16 and 8,779.64 is: 13,172.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,639.86 : 27,966.16 = 8,779.64 : x
  2. Step 2: Convert to fraction form
    18,639.86/27,966.16 = 8,779.64/x
  3. Step 3: Cross multiply
    18,639.86x = 27,966.16 × 8,779.64
  4. Step 4: Simplify right side
    18,639.86x = 245,532,816.98
  5. Step 5: Solve for x
    x = 245,532,816.98/18,639.86
  6. Step 6: Final answer
    x = 13,172.46

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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.