Home / 81,840.87-122,763.78-31,918.95

Finding the Fourth Proportional to 81,840.87, 122,763.78 and 31,918.95

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Solution

The fourth proportional to 81,840.87, 122,763.78 and 31,918.95 is: 47,879.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,840.87 : 122,763.78 = 31,918.95 : x
  2. Step 2: Convert to fraction form
    81,840.87/122,763.78 = 31,918.95/x
  3. Step 3: Cross multiply
    81,840.87x = 122,763.78 × 31,918.95
  4. Step 4: Simplify right side
    81,840.87x = 3,918,490,955.63
  5. Step 5: Solve for x
    x = 3,918,490,955.63/81,840.87
  6. Step 6: Final answer
    x = 47,879.39

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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.