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Finding the Fourth Proportional to 139,089.60, 191,930.40 and 82,490.40

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Solution

The fourth proportional to 139,089.60, 191,930.40 and 82,490.40 is: 113,828.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,089.60 : 191,930.40 = 82,490.40 : x
  2. Step 2: Convert to fraction form
    139,089.60/191,930.40 = 82,490.40/x
  3. Step 3: Cross multiply
    139,089.60x = 191,930.40 × 82,490.40
  4. Step 4: Simplify right side
    139,089.60x = 15,832,415,468.16
  5. Step 5: Solve for x
    x = 15,832,415,468.16/139,089.60
  6. Step 6: Final answer
    x = 113,828.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.