Home / 1,418.13-2,125.53-686.07

Finding the Fourth Proportional to 1,418.13, 2,125.53 and 686.07

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Solution

The fourth proportional to 1,418.13, 2,125.53 and 686.07 is: 1,028.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,418.13 : 2,125.53 = 686.07 : x
  2. Step 2: Convert to fraction form
    1,418.13/2,125.53 = 686.07/x
  3. Step 3: Cross multiply
    1,418.13x = 2,125.53 × 686.07
  4. Step 4: Simplify right side
    1,418.13x = 1,458,262.37
  5. Step 5: Solve for x
    x = 1,458,262.37/1,418.13
  6. Step 6: Final answer
    x = 1,028.30

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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.