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Finding the Fourth Proportional to 121,440.60, 182,160.90 and 86,011.20

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Solution

The fourth proportional to 121,440.60, 182,160.90 and 86,011.20 is: 129,016.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,440.60 : 182,160.90 = 86,011.20 : x
  2. Step 2: Convert to fraction form
    121,440.60/182,160.90 = 86,011.20/x
  3. Step 3: Cross multiply
    121,440.60x = 182,160.90 × 86,011.20
  4. Step 4: Simplify right side
    121,440.60x = 15,667,877,602.08
  5. Step 5: Solve for x
    x = 15,667,877,602.08/121,440.60
  6. Step 6: Final answer
    x = 129,016.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.