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Finding the Fourth Proportional to 1,039, 1,556.28 and 672.70

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Solution

The fourth proportional to 1,039, 1,556.28 and 672.70 is: 1,007.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039 : 1,556.28 = 672.70 : x
  2. Step 2: Convert to fraction form
    1,039/1,556.28 = 672.70/x
  3. Step 3: Cross multiply
    1,039x = 1,556.28 × 672.70
  4. Step 4: Simplify right side
    1,039x = 1,046,909.56
  5. Step 5: Solve for x
    x = 1,046,909.56/1,039
  6. Step 6: Final answer
    x = 1,007.61

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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.