Home / 1,138.20-1,707.31-407.27

Finding the Fourth Proportional to 1,138.20, 1,707.31 and 407.27

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Solution

The fourth proportional to 1,138.20, 1,707.31 and 407.27 is: 610.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.20 : 1,707.31 = 407.27 : x
  2. Step 2: Convert to fraction form
    1,138.20/1,707.31 = 407.27/x
  3. Step 3: Cross multiply
    1,138.20x = 1,707.31 × 407.27
  4. Step 4: Simplify right side
    1,138.20x = 695,336.14
  5. Step 5: Solve for x
    x = 695,336.14/1,138.20
  6. Step 6: Final answer
    x = 610.91

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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.