Home / 2,159.16-2,979.66-1,215

Finding the Fourth Proportional to 2,159.16, 2,979.66 and 1,215

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Solution

The fourth proportional to 2,159.16, 2,979.66 and 1,215 is: 1,676.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,159.16 : 2,979.66 = 1,215 : x
  2. Step 2: Convert to fraction form
    2,159.16/2,979.66 = 1,215/x
  3. Step 3: Cross multiply
    2,159.16x = 2,979.66 × 1,215
  4. Step 4: Simplify right side
    2,159.16x = 3,620,286.90
  5. Step 5: Solve for x
    x = 3,620,286.90/2,159.16
  6. Step 6: Final answer
    x = 1,676.71

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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.