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Finding the Fourth Proportional to 189,879.62, 284,959.60 and 90,040.14

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Solution

The fourth proportional to 189,879.62, 284,959.60 and 90,040.14 is: 135,126.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    189,879.62 : 284,959.60 = 90,040.14 : x
  2. Step 2: Convert to fraction form
    189,879.62/284,959.60 = 90,040.14/x
  3. Step 3: Cross multiply
    189,879.62x = 284,959.60 × 90,040.14
  4. Step 4: Simplify right side
    189,879.62x = 25,657,802,503.44
  5. Step 5: Solve for x
    x = 25,657,802,503.44/189,879.62
  6. Step 6: Final answer
    x = 135,126.68

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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.