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Finding the Fourth Proportional to 86,906.90, 121,932.10 and 86,906.90

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Solution

The fourth proportional to 86,906.90, 121,932.10 and 86,906.90 is: 121,932.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,906.90 : 121,932.10 = 86,906.90 : x
  2. Step 2: Convert to fraction form
    86,906.90/121,932.10 = 86,906.90/x
  3. Step 3: Cross multiply
    86,906.90x = 121,932.10 × 86,906.90
  4. Step 4: Simplify right side
    86,906.90x = 10,596,740,821.49
  5. Step 5: Solve for x
    x = 10,596,740,821.49/86,906.90
  6. Step 6: Final answer
    x = 121,932.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.