Home / 81,318.56-121,920.24-31,356.32

Finding the Fourth Proportional to 81,318.56, 121,920.24 and 31,356.32

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Solution

The fourth proportional to 81,318.56, 121,920.24 and 31,356.32 is: 47,012.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,318.56 : 121,920.24 = 31,356.32 : x
  2. Step 2: Convert to fraction form
    81,318.56/121,920.24 = 31,356.32/x
  3. Step 3: Cross multiply
    81,318.56x = 121,920.24 × 31,356.32
  4. Step 4: Simplify right side
    81,318.56x = 3,822,970,059.92
  5. Step 5: Solve for x
    x = 3,822,970,059.92/81,318.56
  6. Step 6: Final answer
    x = 47,012.27

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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.