Home / 81,647.12-122,478.42-31,731.07

Finding the Fourth Proportional to 81,647.12, 122,478.42 and 31,731.07

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Solution

The fourth proportional to 81,647.12, 122,478.42 and 31,731.07 is: 47,599.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,647.12 : 122,478.42 = 31,731.07 : x
  2. Step 2: Convert to fraction form
    81,647.12/122,478.42 = 31,731.07/x
  3. Step 3: Cross multiply
    81,647.12x = 122,478.42 × 31,731.07
  4. Step 4: Simplify right side
    81,647.12x = 3,886,371,318.51
  5. Step 5: Solve for x
    x = 3,886,371,318.51/81,647.12
  6. Step 6: Final answer
    x = 47,599.61

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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.