Home / 2,815.13-4,218.08-1,989.37

Finding the Fourth Proportional to 2,815.13, 4,218.08 and 1,989.37

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Solution

The fourth proportional to 2,815.13, 4,218.08 and 1,989.37 is: 2,980.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,815.13 : 4,218.08 = 1,989.37 : x
  2. Step 2: Convert to fraction form
    2,815.13/4,218.08 = 1,989.37/x
  3. Step 3: Cross multiply
    2,815.13x = 4,218.08 × 1,989.37
  4. Step 4: Simplify right side
    2,815.13x = 8,391,321.81
  5. Step 5: Solve for x
    x = 8,391,321.81/2,815.13
  6. Step 6: Final answer
    x = 2,980.79

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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.