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Finding the Fourth Proportional to 86,072.88, 128,244.21 and 81,238.44

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Solution

The fourth proportional to 86,072.88, 128,244.21 and 81,238.44 is: 121,041.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,072.88 : 128,244.21 = 81,238.44 : x
  2. Step 2: Convert to fraction form
    86,072.88/128,244.21 = 81,238.44/x
  3. Step 3: Cross multiply
    86,072.88x = 128,244.21 × 81,238.44
  4. Step 4: Simplify right side
    86,072.88x = 10,418,359,559.43
  5. Step 5: Solve for x
    x = 10,418,359,559.43/86,072.88
  6. Step 6: Final answer
    x = 121,041.14

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.