Home / 3,980.79-5,490.76-2,386.33

Finding the Fourth Proportional to 3,980.79, 5,490.76 and 2,386.33

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Solution

The fourth proportional to 3,980.79, 5,490.76 and 2,386.33 is: 3,291.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,980.79 : 5,490.76 = 2,386.33 : x
  2. Step 2: Convert to fraction form
    3,980.79/5,490.76 = 2,386.33/x
  3. Step 3: Cross multiply
    3,980.79x = 5,490.76 × 2,386.33
  4. Step 4: Simplify right side
    3,980.79x = 13,102,765.31
  5. Step 5: Solve for x
    x = 13,102,765.31/3,980.79
  6. Step 6: Final answer
    x = 3,291.50

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1.5x scale

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.