Home / 2,115.13-3,164.65-1,279.11

Finding the Fourth Proportional to 2,115.13, 3,164.65 and 1,279.11

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Solution

The fourth proportional to 2,115.13, 3,164.65 and 1,279.11 is: 1,913.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.13 : 3,164.65 = 1,279.11 : x
  2. Step 2: Convert to fraction form
    2,115.13/3,164.65 = 1,279.11/x
  3. Step 3: Cross multiply
    2,115.13x = 3,164.65 × 1,279.11
  4. Step 4: Simplify right side
    2,115.13x = 4,047,935.46
  5. Step 5: Solve for x
    x = 4,047,935.46/2,115.13
  6. Step 6: Final answer
    x = 1,913.80

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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.