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Finding the Fourth Proportional to 91,206.40, 136,809.60 and 66,128.80

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Solution

The fourth proportional to 91,206.40, 136,809.60 and 66,128.80 is: 99,193.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,206.40 : 136,809.60 = 66,128.80 : x
  2. Step 2: Convert to fraction form
    91,206.40/136,809.60 = 66,128.80/x
  3. Step 3: Cross multiply
    91,206.40x = 136,809.60 × 66,128.80
  4. Step 4: Simplify right side
    91,206.40x = 9,047,054,676.48
  5. Step 5: Solve for x
    x = 9,047,054,676.48/91,206.40
  6. Step 6: Final answer
    x = 99,193.20

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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.