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Finding the Fourth Proportional to 129,972.40, 194,958.60 and 91,918.60

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Solution

The fourth proportional to 129,972.40, 194,958.60 and 91,918.60 is: 137,877.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,972.40 : 194,958.60 = 91,918.60 : x
  2. Step 2: Convert to fraction form
    129,972.40/194,958.60 = 91,918.60/x
  3. Step 3: Cross multiply
    129,972.40x = 194,958.60 × 91,918.60
  4. Step 4: Simplify right side
    129,972.40x = 17,920,321,569.96
  5. Step 5: Solve for x
    x = 17,920,321,569.96/129,972.40
  6. Step 6: Final answer
    x = 137,877.90

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1.5x scale

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.