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Finding the Fourth Proportional to 128,487.06, 191,644.11 and 121,078.13

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Solution

The fourth proportional to 128,487.06, 191,644.11 and 121,078.13 is: 180,593.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,487.06 : 191,644.11 = 121,078.13 : x
  2. Step 2: Convert to fraction form
    128,487.06/191,644.11 = 121,078.13/x
  3. Step 3: Cross multiply
    128,487.06x = 191,644.11 × 121,078.13
  4. Step 4: Simplify right side
    128,487.06x = 23,203,909,506.09
  5. Step 5: Solve for x
    x = 23,203,909,506.09/128,487.06
  6. Step 6: Final answer
    x = 180,593.36

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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.