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Finding the Fourth Proportional to 28,611.82, 42,923.20 and 8,889.64

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Solution

The fourth proportional to 28,611.82, 42,923.20 and 8,889.64 is: 13,336.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,611.82 : 42,923.20 = 8,889.64 : x
  2. Step 2: Convert to fraction form
    28,611.82/42,923.20 = 8,889.64/x
  3. Step 3: Cross multiply
    28,611.82x = 42,923.20 × 8,889.64
  4. Step 4: Simplify right side
    28,611.82x = 381,571,795.65
  5. Step 5: Solve for x
    x = 381,571,795.65/28,611.82
  6. Step 6: Final answer
    x = 13,336.16

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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.