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Finding the Fourth Proportional to 203,911.53, 305,985.77 and 83,980.55

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Solution

The fourth proportional to 203,911.53, 305,985.77 and 83,980.55 is: 126,019.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    203,911.53 : 305,985.77 = 83,980.55 : x
  2. Step 2: Convert to fraction form
    203,911.53/305,985.77 = 83,980.55/x
  3. Step 3: Cross multiply
    203,911.53x = 305,985.77 × 83,980.55
  4. Step 4: Simplify right side
    203,911.53x = 25,696,853,256.77
  5. Step 5: Solve for x
    x = 25,696,853,256.77/203,911.53
  6. Step 6: Final answer
    x = 126,019.62

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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.