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Finding the Fourth Proportional to 66,072.78, 99,109.98 and 19,326.60

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Solution

The fourth proportional to 66,072.78, 99,109.98 and 19,326.60 is: 28,990.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,072.78 : 99,109.98 = 19,326.60 : x
  2. Step 2: Convert to fraction form
    66,072.78/99,109.98 = 19,326.60/x
  3. Step 3: Cross multiply
    66,072.78x = 99,109.98 × 19,326.60
  4. Step 4: Simplify right side
    66,072.78x = 1,915,458,939.47
  5. Step 5: Solve for x
    x = 1,915,458,939.47/66,072.78
  6. Step 6: Final answer
    x = 28,990.14

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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.