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Finding the Fourth Proportional to 1,267.12, 1,900.65 and 445.39

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Solution

The fourth proportional to 1,267.12, 1,900.65 and 445.39 is: 668.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,267.12 : 1,900.65 = 445.39 : x
  2. Step 2: Convert to fraction form
    1,267.12/1,900.65 = 445.39/x
  3. Step 3: Cross multiply
    1,267.12x = 1,900.65 × 445.39
  4. Step 4: Simplify right side
    1,267.12x = 846,530.50
  5. Step 5: Solve for x
    x = 846,530.50/1,267.12
  6. Step 6: Final answer
    x = 668.07

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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.