Home / 1,318.89-1,979.32-625.75

Finding the Fourth Proportional to 1,318.89, 1,979.32 and 625.75

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Solution

The fourth proportional to 1,318.89, 1,979.32 and 625.75 is: 939.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.89 : 1,979.32 = 625.75 : x
  2. Step 2: Convert to fraction form
    1,318.89/1,979.32 = 625.75/x
  3. Step 3: Cross multiply
    1,318.89x = 1,979.32 × 625.75
  4. Step 4: Simplify right side
    1,318.89x = 1,238,559.49
  5. Step 5: Solve for x
    x = 1,238,559.49/1,318.89
  6. Step 6: Final answer
    x = 939.09

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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.