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Finding the Fourth Proportional to 91,107.70, 136,661.55 and 80,662.90

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Solution

The fourth proportional to 91,107.70, 136,661.55 and 80,662.90 is: 120,994.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,107.70 : 136,661.55 = 80,662.90 : x
  2. Step 2: Convert to fraction form
    91,107.70/136,661.55 = 80,662.90/x
  3. Step 3: Cross multiply
    91,107.70x = 136,661.55 × 80,662.90
  4. Step 4: Simplify right side
    91,107.70x = 11,023,516,941.50
  5. Step 5: Solve for x
    x = 11,023,516,941.50/91,107.70
  6. Step 6: Final answer
    x = 120,994.35

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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.