Home / 81,970.13-122,873.11-31,981.45

Finding the Fourth Proportional to 81,970.13, 122,873.11 and 31,981.45

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Solution

The fourth proportional to 81,970.13, 122,873.11 and 31,981.45 is: 47,940.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,970.13 : 122,873.11 = 31,981.45 : x
  2. Step 2: Convert to fraction form
    81,970.13/122,873.11 = 31,981.45/x
  3. Step 3: Cross multiply
    81,970.13x = 122,873.11 × 31,981.45
  4. Step 4: Simplify right side
    81,970.13x = 3,929,660,063.90
  5. Step 5: Solve for x
    x = 3,929,660,063.90/81,970.13
  6. Step 6: Final answer
    x = 47,940.15

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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.