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Finding the Fourth Proportional to 84,081.80, 115,912.28 and 66,145.64

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Solution

The fourth proportional to 84,081.80, 115,912.28 and 66,145.64 is: 91,186.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,081.80 : 115,912.28 = 66,145.64 : x
  2. Step 2: Convert to fraction form
    84,081.80/115,912.28 = 66,145.64/x
  3. Step 3: Cross multiply
    84,081.80x = 115,912.28 × 66,145.64
  4. Step 4: Simplify right side
    84,081.80x = 7,667,091,530.26
  5. Step 5: Solve for x
    x = 7,667,091,530.26/84,081.80
  6. Step 6: Final answer
    x = 91,186.10

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1.5x scale

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.