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Finding the Fourth Proportional to 136,958.40, 205,437.60 and 91,857.60

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Solution

The fourth proportional to 136,958.40, 205,437.60 and 91,857.60 is: 137,786.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,958.40 : 205,437.60 = 91,857.60 : x
  2. Step 2: Convert to fraction form
    136,958.40/205,437.60 = 91,857.60/x
  3. Step 3: Cross multiply
    136,958.40x = 205,437.60 × 91,857.60
  4. Step 4: Simplify right side
    136,958.40x = 18,871,004,885.76
  5. Step 5: Solve for x
    x = 18,871,004,885.76/136,958.40
  6. Step 6: Final answer
    x = 137,786.40

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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.