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Finding the Fourth Proportional to 128,666.70, 193,000.05 and 121,449.60

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Solution

The fourth proportional to 128,666.70, 193,000.05 and 121,449.60 is: 182,174.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,666.70 : 193,000.05 = 121,449.60 : x
  2. Step 2: Convert to fraction form
    128,666.70/193,000.05 = 121,449.60/x
  3. Step 3: Cross multiply
    128,666.70x = 193,000.05 × 121,449.60
  4. Step 4: Simplify right side
    128,666.70x = 23,439,778,872.48
  5. Step 5: Solve for x
    x = 23,439,778,872.48/128,666.70
  6. Step 6: Final answer
    x = 182,174.40

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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.