Home / 81,080.77-111,792.18-66,690.31

Finding the Fourth Proportional to 81,080.77, 111,792.18 and 66,690.31

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Solution

The fourth proportional to 81,080.77, 111,792.18 and 66,690.31 is: 91,950.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,080.77 : 111,792.18 = 66,690.31 : x
  2. Step 2: Convert to fraction form
    81,080.77/111,792.18 = 66,690.31/x
  3. Step 3: Cross multiply
    81,080.77x = 111,792.18 × 66,690.31
  4. Step 4: Simplify right side
    81,080.77x = 7,455,455,139.78
  5. Step 5: Solve for x
    x = 7,455,455,139.78/81,080.77
  6. Step 6: Final answer
    x = 91,950.97

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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.