Home / 1,039.58-1,556.94-821.70

Finding the Fourth Proportional to 1,039.58, 1,556.94 and 821.70

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Solution

The fourth proportional to 1,039.58, 1,556.94 and 821.70 is: 1,230.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.58 : 1,556.94 = 821.70 : x
  2. Step 2: Convert to fraction form
    1,039.58/1,556.94 = 821.70/x
  3. Step 3: Cross multiply
    1,039.58x = 1,556.94 × 821.70
  4. Step 4: Simplify right side
    1,039.58x = 1,279,337.60
  5. Step 5: Solve for x
    x = 1,279,337.60/1,039.58
  6. Step 6: Final answer
    x = 1,230.63

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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.