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Finding the Fourth Proportional to 333,990.54, 500,978.49 and 81,272.70

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Solution

The fourth proportional to 333,990.54, 500,978.49 and 81,272.70 is: 121,907.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    333,990.54 : 500,978.49 = 81,272.70 : x
  2. Step 2: Convert to fraction form
    333,990.54/500,978.49 = 81,272.70/x
  3. Step 3: Cross multiply
    333,990.54x = 500,978.49 × 81,272.70
  4. Step 4: Simplify right side
    333,990.54x = 40,715,874,219.45
  5. Step 5: Solve for x
    x = 40,715,874,219.45/333,990.54
  6. Step 6: Final answer
    x = 121,907.27

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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.