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Finding the Fourth Proportional to 128,909.56, 193,369.58 and 61,406.89

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Solution

The fourth proportional to 128,909.56, 193,369.58 and 61,406.89 is: 92,112.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,909.56 : 193,369.58 = 61,406.89 : x
  2. Step 2: Convert to fraction form
    128,909.56/193,369.58 = 61,406.89/x
  3. Step 3: Cross multiply
    128,909.56x = 193,369.58 × 61,406.89
  4. Step 4: Simplify right side
    128,909.56x = 11,874,225,055.93
  5. Step 5: Solve for x
    x = 11,874,225,055.93/128,909.56
  6. Step 6: Final answer
    x = 92,112.84

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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.