Home / 78,540.89-117,735.20-31,140.50

Finding the Fourth Proportional to 78,540.89, 117,735.20 and 31,140.50

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Solution

The fourth proportional to 78,540.89, 117,735.20 and 31,140.50 is: 46,680.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,540.89 : 117,735.20 = 31,140.50 : x
  2. Step 2: Convert to fraction form
    78,540.89/117,735.20 = 31,140.50/x
  3. Step 3: Cross multiply
    78,540.89x = 117,735.20 × 31,140.50
  4. Step 4: Simplify right side
    78,540.89x = 3,666,332,839.90
  5. Step 5: Solve for x
    x = 3,666,332,839.90/78,540.89
  6. Step 6: Final answer
    x = 46,680.56

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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.