Home / 1,291.13-1,786.44-1,125.68

Finding the Fourth Proportional to 1,291.13, 1,786.44 and 1,125.68

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Solution

The fourth proportional to 1,291.13, 1,786.44 and 1,125.68 is: 1,557.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.13 : 1,786.44 = 1,125.68 : x
  2. Step 2: Convert to fraction form
    1,291.13/1,786.44 = 1,125.68/x
  3. Step 3: Cross multiply
    1,291.13x = 1,786.44 × 1,125.68
  4. Step 4: Simplify right side
    1,291.13x = 2,010,968.47
  5. Step 5: Solve for x
    x = 2,010,968.47/1,291.13
  6. Step 6: Final answer
    x = 1,557.53

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.