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Finding the Fourth Proportional to 91,834.40, 137,751.60 and 85,613.60

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Solution

The fourth proportional to 91,834.40, 137,751.60 and 85,613.60 is: 128,420.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,834.40 : 137,751.60 = 85,613.60 : x
  2. Step 2: Convert to fraction form
    91,834.40/137,751.60 = 85,613.60/x
  3. Step 3: Cross multiply
    91,834.40x = 137,751.60 × 85,613.60
  4. Step 4: Simplify right side
    91,834.40x = 11,793,410,381.76
  5. Step 5: Solve for x
    x = 11,793,410,381.76/91,834.40
  6. Step 6: Final answer
    x = 128,420.40

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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.