Home / 81,356.40-121,845.06-79,114.12

Finding the Fourth Proportional to 81,356.40, 121,845.06 and 79,114.12

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Solution

The fourth proportional to 81,356.40, 121,845.06 and 79,114.12 is: 118,486.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,356.40 : 121,845.06 = 79,114.12 : x
  2. Step 2: Convert to fraction form
    81,356.40/121,845.06 = 79,114.12/x
  3. Step 3: Cross multiply
    81,356.40x = 121,845.06 × 79,114.12
  4. Step 4: Simplify right side
    81,356.40x = 9,639,664,393.63
  5. Step 5: Solve for x
    x = 9,639,664,393.63/81,356.40
  6. Step 6: Final answer
    x = 118,486.86

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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.