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Finding the Fourth Proportional to 91,211.60, 136,817.40 and 81,880.40

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Solution

The fourth proportional to 91,211.60, 136,817.40 and 81,880.40 is: 122,820.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,211.60 : 136,817.40 = 81,880.40 : x
  2. Step 2: Convert to fraction form
    91,211.60/136,817.40 = 81,880.40/x
  3. Step 3: Cross multiply
    91,211.60x = 136,817.40 × 81,880.40
  4. Step 4: Simplify right side
    91,211.60x = 11,202,663,438.96
  5. Step 5: Solve for x
    x = 11,202,663,438.96/91,211.60
  6. Step 6: Final answer
    x = 122,820.60

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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.