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Finding the Fourth Proportional to 139,130.87, 191,787.55 and 85,316.09

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Solution

The fourth proportional to 139,130.87, 191,787.55 and 85,316.09 is: 117,605.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,130.87 : 191,787.55 = 85,316.09 : x
  2. Step 2: Convert to fraction form
    139,130.87/191,787.55 = 85,316.09/x
  3. Step 3: Cross multiply
    139,130.87x = 191,787.55 × 85,316.09
  4. Step 4: Simplify right side
    139,130.87x = 16,362,562,704.45
  5. Step 5: Solve for x
    x = 16,362,562,704.45/139,130.87
  6. Step 6: Final answer
    x = 117,605.56

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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.