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Finding the Fourth Proportional to 1,249.85, 1,875.30 and 672.05

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Solution

The fourth proportional to 1,249.85, 1,875.30 and 672.05 is: 1,008.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,249.85 : 1,875.30 = 672.05 : x
  2. Step 2: Convert to fraction form
    1,249.85/1,875.30 = 672.05/x
  3. Step 3: Cross multiply
    1,249.85x = 1,875.30 × 672.05
  4. Step 4: Simplify right side
    1,249.85x = 1,260,295.37
  5. Step 5: Solve for x
    x = 1,260,295.37/1,249.85
  6. Step 6: Final answer
    x = 1,008.36

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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.