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Finding the Fourth Proportional to 121,343.70, 182,015.55 and 85,914.30

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Solution

The fourth proportional to 121,343.70, 182,015.55 and 85,914.30 is: 128,871.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,343.70 : 182,015.55 = 85,914.30 : x
  2. Step 2: Convert to fraction form
    121,343.70/182,015.55 = 85,914.30/x
  3. Step 3: Cross multiply
    121,343.70x = 182,015.55 × 85,914.30
  4. Step 4: Simplify right side
    121,343.70x = 15,637,738,567.37
  5. Step 5: Solve for x
    x = 15,637,738,567.37/121,343.70
  6. Step 6: Final answer
    x = 128,871.45

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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.