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Finding the Fourth Proportional to 128,913.20, 193,515.60 and 99,461.60

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Solution

The fourth proportional to 128,913.20, 193,515.60 and 99,461.60 is: 149,304.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,913.20 : 193,515.60 = 99,461.60 : x
  2. Step 2: Convert to fraction form
    128,913.20/193,515.60 = 99,461.60/x
  3. Step 3: Cross multiply
    128,913.20x = 193,515.60 × 99,461.60
  4. Step 4: Simplify right side
    128,913.20x = 19,247,371,200.96
  5. Step 5: Solve for x
    x = 19,247,371,200.96/128,913.20
  6. Step 6: Final answer
    x = 149,304.89

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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.