Home / 1,905.20-2,857.70-1,115.00

Finding the Fourth Proportional to 1,905.20, 2,857.70 and 1,115.00

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Solution

The fourth proportional to 1,905.20, 2,857.70 and 1,115.00 is: 1,672.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,905.20 : 2,857.70 = 1,115.00 : x
  2. Step 2: Convert to fraction form
    1,905.20/2,857.70 = 1,115.00/x
  3. Step 3: Cross multiply
    1,905.20x = 2,857.70 × 1,115.00
  4. Step 4: Simplify right side
    1,905.20x = 3,186,333.81
  5. Step 5: Solve for x
    x = 3,186,333.81/1,905.20
  6. Step 6: Final answer
    x = 1,672.44

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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.