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Finding the Fourth Proportional to 93,138.21, 139,031.12 and 86,199.57

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Solution

The fourth proportional to 93,138.21, 139,031.12 and 86,199.57 is: 128,673.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    93,138.21 : 139,031.12 = 86,199.57 : x
  2. Step 2: Convert to fraction form
    93,138.21/139,031.12 = 86,199.57/x
  3. Step 3: Cross multiply
    93,138.21x = 139,031.12 × 86,199.57
  4. Step 4: Simplify right side
    93,138.21x = 11,984,422,976.12
  5. Step 5: Solve for x
    x = 11,984,422,976.12/93,138.21
  6. Step 6: Final answer
    x = 128,673.54

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.