Home / 1,290.12-1,935.24-640.44

Finding the Fourth Proportional to 1,290.12, 1,935.24 and 640.44

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Solution

The fourth proportional to 1,290.12, 1,935.24 and 640.44 is: 960.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.12 : 1,935.24 = 640.44 : x
  2. Step 2: Convert to fraction form
    1,290.12/1,935.24 = 640.44/x
  3. Step 3: Cross multiply
    1,290.12x = 1,935.24 × 640.44
  4. Step 4: Simplify right side
    1,290.12x = 1,239,405.11
  5. Step 5: Solve for x
    x = 1,239,405.11/1,290.12
  6. Step 6: Final answer
    x = 960.69

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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.