Home / 86,664.60-129,851.10-81,415.80

Finding the Fourth Proportional to 86,664.60, 129,851.10 and 81,415.80

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Solution

The fourth proportional to 86,664.60, 129,851.10 and 81,415.80 is: 121,986.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,664.60 : 129,851.10 = 81,415.80 : x
  2. Step 2: Convert to fraction form
    86,664.60/129,851.10 = 81,415.80/x
  3. Step 3: Cross multiply
    86,664.60x = 129,851.10 × 81,415.80
  4. Step 4: Simplify right side
    86,664.60x = 10,571,931,187.38
  5. Step 5: Solve for x
    x = 10,571,931,187.38/86,664.60
  6. Step 6: Final answer
    x = 121,986.73

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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.