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Finding the Fourth Proportional to 66,375.86, 99,548.06 and 18,989.48

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Solution

The fourth proportional to 66,375.86, 99,548.06 and 18,989.48 is: 28,479.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,375.86 : 99,548.06 = 18,989.48 : x
  2. Step 2: Convert to fraction form
    66,375.86/99,548.06 = 18,989.48/x
  3. Step 3: Cross multiply
    66,375.86x = 99,548.06 × 18,989.48
  4. Step 4: Simplify right side
    66,375.86x = 1,890,366,048.33
  5. Step 5: Solve for x
    x = 1,890,366,048.33/66,375.86
  6. Step 6: Final answer
    x = 28,479.72

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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.