Home / 81,172.90-121,776.09-28,619.02

Finding the Fourth Proportional to 81,172.90, 121,776.09 and 28,619.02

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Solution

The fourth proportional to 81,172.90, 121,776.09 and 28,619.02 is: 42,934.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,172.90 : 121,776.09 = 28,619.02 : x
  2. Step 2: Convert to fraction form
    81,172.90/121,776.09 = 28,619.02/x
  3. Step 3: Cross multiply
    81,172.90x = 121,776.09 × 28,619.02
  4. Step 4: Simplify right side
    81,172.90x = 3,485,112,355.23
  5. Step 5: Solve for x
    x = 3,485,112,355.23/81,172.90
  6. Step 6: Final answer
    x = 42,934.43

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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.