Home / 1,288.05-1,927.45-1,115.31

Finding the Fourth Proportional to 1,288.05, 1,927.45 and 1,115.31

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Solution

The fourth proportional to 1,288.05, 1,927.45 and 1,115.31 is: 1,668.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.05 : 1,927.45 = 1,115.31 : x
  2. Step 2: Convert to fraction form
    1,288.05/1,927.45 = 1,115.31/x
  3. Step 3: Cross multiply
    1,288.05x = 1,927.45 × 1,115.31
  4. Step 4: Simplify right side
    1,288.05x = 2,149,698.43
  5. Step 5: Solve for x
    x = 2,149,698.43/1,288.05
  6. Step 6: Final answer
    x = 1,668.96

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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.