Home / 2,139.18-3,207.15-1,905.90

Finding the Fourth Proportional to 2,139.18, 3,207.15 and 1,905.90

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Solution

The fourth proportional to 2,139.18, 3,207.15 and 1,905.90 is: 2,857.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,139.18 : 3,207.15 = 1,905.90 : x
  2. Step 2: Convert to fraction form
    2,139.18/3,207.15 = 1,905.90/x
  3. Step 3: Cross multiply
    2,139.18x = 3,207.15 × 1,905.90
  4. Step 4: Simplify right side
    2,139.18x = 6,112,507.19
  5. Step 5: Solve for x
    x = 6,112,507.19/2,139.18
  6. Step 6: Final answer
    x = 2,857.41

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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.