Home / 1,287.25-1,930.85-313.36

Finding the Fourth Proportional to 1,287.25, 1,930.85 and 313.36

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Solution

The fourth proportional to 1,287.25, 1,930.85 and 313.36 is: 470.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.25 : 1,930.85 = 313.36 : x
  2. Step 2: Convert to fraction form
    1,287.25/1,930.85 = 313.36/x
  3. Step 3: Cross multiply
    1,287.25x = 1,930.85 × 313.36
  4. Step 4: Simplify right side
    1,287.25x = 605,051.16
  5. Step 5: Solve for x
    x = 605,051.16/1,287.25
  6. Step 6: Final answer
    x = 470.03

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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.