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Finding the Fourth Proportional to 128,122.56, 192,209.76 and 45,074.88

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Solution

The fourth proportional to 128,122.56, 192,209.76 and 45,074.88 is: 67,621.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,122.56 : 192,209.76 = 45,074.88 : x
  2. Step 2: Convert to fraction form
    128,122.56/192,209.76 = 45,074.88/x
  3. Step 3: Cross multiply
    128,122.56x = 192,209.76 × 45,074.88
  4. Step 4: Simplify right side
    128,122.56x = 8,663,831,866.83
  5. Step 5: Solve for x
    x = 8,663,831,866.83/128,122.56
  6. Step 6: Final answer
    x = 67,621.44

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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.