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Finding the Fourth Proportional to 121,873.68, 168,188.40 and 86,126.76

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Solution

The fourth proportional to 121,873.68, 168,188.40 and 86,126.76 is: 118,856.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,873.68 : 168,188.40 = 86,126.76 : x
  2. Step 2: Convert to fraction form
    121,873.68/168,188.40 = 86,126.76/x
  3. Step 3: Cross multiply
    121,873.68x = 168,188.40 × 86,126.76
  4. Step 4: Simplify right side
    121,873.68x = 14,485,521,961.58
  5. Step 5: Solve for x
    x = 14,485,521,961.58/121,873.68
  6. Step 6: Final answer
    x = 118,856.85

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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.