Home / 1,087.13-1,629.73-393.65

Finding the Fourth Proportional to 1,087.13, 1,629.73 and 393.65

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Solution

The fourth proportional to 1,087.13, 1,629.73 and 393.65 is: 590.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.13 : 1,629.73 = 393.65 : x
  2. Step 2: Convert to fraction form
    1,087.13/1,629.73 = 393.65/x
  3. Step 3: Cross multiply
    1,087.13x = 1,629.73 × 393.65
  4. Step 4: Simplify right side
    1,087.13x = 641,533.10
  5. Step 5: Solve for x
    x = 641,533.10/1,087.13
  6. Step 6: Final answer
    x = 590.12

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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.