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Finding the Fourth Proportional to 128,990.68, 193,494.55 and 34,219.53

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Solution

The fourth proportional to 128,990.68, 193,494.55 and 34,219.53 is: 51,331.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,990.68 : 193,494.55 = 34,219.53 : x
  2. Step 2: Convert to fraction form
    128,990.68/193,494.55 = 34,219.53/x
  3. Step 3: Cross multiply
    128,990.68x = 193,494.55 × 34,219.53
  4. Step 4: Simplify right side
    128,990.68x = 6,621,292,558.56
  5. Step 5: Solve for x
    x = 6,621,292,558.56/128,990.68
  6. Step 6: Final answer
    x = 51,331.56

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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.