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Finding the Fourth Proportional to 1,259.93, 1,890.43 and 674.78

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Solution

The fourth proportional to 1,259.93, 1,890.43 and 674.78 is: 1,012.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259.93 : 1,890.43 = 674.78 : x
  2. Step 2: Convert to fraction form
    1,259.93/1,890.43 = 674.78/x
  3. Step 3: Cross multiply
    1,259.93x = 1,890.43 × 674.78
  4. Step 4: Simplify right side
    1,259.93x = 1,275,613.22
  5. Step 5: Solve for x
    x = 1,275,613.22/1,259.93
  6. Step 6: Final answer
    x = 1,012.45

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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.