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Finding the Fourth Proportional to 91,000.40, 136,500.60 and 85,816.40

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Solution

The fourth proportional to 91,000.40, 136,500.60 and 85,816.40 is: 128,724.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,000.40 : 136,500.60 = 85,816.40 : x
  2. Step 2: Convert to fraction form
    91,000.40/136,500.60 = 85,816.40/x
  3. Step 3: Cross multiply
    91,000.40x = 136,500.60 × 85,816.40
  4. Step 4: Simplify right side
    91,000.40x = 11,713,990,089.84
  5. Step 5: Solve for x
    x = 11,713,990,089.84/91,000.40
  6. Step 6: Final answer
    x = 128,724.60

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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.