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Finding the Fourth Proportional to 138,912.64, 191,716.80 and 82,345.60

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Solution

The fourth proportional to 138,912.64, 191,716.80 and 82,345.60 is: 113,647.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,912.64 : 191,716.80 = 82,345.60 : x
  2. Step 2: Convert to fraction form
    138,912.64/191,716.80 = 82,345.60/x
  3. Step 3: Cross multiply
    138,912.64x = 191,716.80 × 82,345.60
  4. Step 4: Simplify right side
    138,912.64x = 15,787,034,926.08
  5. Step 5: Solve for x
    x = 15,787,034,926.08/138,912.64
  6. Step 6: Final answer
    x = 113,647.22

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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.