Home / 81,610.10-112,735.48-77,619.78

Finding the Fourth Proportional to 81,610.10, 112,735.48 and 77,619.78

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Solution

The fourth proportional to 81,610.10, 112,735.48 and 77,619.78 is: 107,223.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,610.10 : 112,735.48 = 77,619.78 : x
  2. Step 2: Convert to fraction form
    81,610.10/112,735.48 = 77,619.78/x
  3. Step 3: Cross multiply
    81,610.10x = 112,735.48 × 77,619.78
  4. Step 4: Simplify right side
    81,610.10x = 8,750,503,155.79
  5. Step 5: Solve for x
    x = 8,750,503,155.79/81,610.10
  6. Step 6: Final answer
    x = 107,223.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.