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Finding the Fourth Proportional to 203,911.10, 305,866.65 and 85,813.10

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Solution

The fourth proportional to 203,911.10, 305,866.65 and 85,813.10 is: 128,719.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    203,911.10 : 305,866.65 = 85,813.10 : x
  2. Step 2: Convert to fraction form
    203,911.10/305,866.65 = 85,813.10/x
  3. Step 3: Cross multiply
    203,911.10x = 305,866.65 × 85,813.10
  4. Step 4: Simplify right side
    203,911.10x = 26,247,365,423.12
  5. Step 5: Solve for x
    x = 26,247,365,423.12/203,911.10
  6. Step 6: Final answer
    x = 128,719.65

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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.