Home / 3,970.31-5,478.93-2,291.70

Finding the Fourth Proportional to 3,970.31, 5,478.93 and 2,291.70

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Solution

The fourth proportional to 3,970.31, 5,478.93 and 2,291.70 is: 3,162.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,970.31 : 5,478.93 = 2,291.70 : x
  2. Step 2: Convert to fraction form
    3,970.31/5,478.93 = 2,291.70/x
  3. Step 3: Cross multiply
    3,970.31x = 5,478.93 × 2,291.70
  4. Step 4: Simplify right side
    3,970.31x = 12,556,063.88
  5. Step 5: Solve for x
    x = 12,556,063.88/3,970.31
  6. Step 6: Final answer
    x = 3,162.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.