Home / 1,418.21-2,124.24-686.25

Finding the Fourth Proportional to 1,418.21, 2,124.24 and 686.25

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Solution

The fourth proportional to 1,418.21, 2,124.24 and 686.25 is: 1,027.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,418.21 : 2,124.24 = 686.25 : x
  2. Step 2: Convert to fraction form
    1,418.21/2,124.24 = 686.25/x
  3. Step 3: Cross multiply
    1,418.21x = 2,124.24 × 686.25
  4. Step 4: Simplify right side
    1,418.21x = 1,457,757.13
  5. Step 5: Solve for x
    x = 1,457,757.13/1,418.21
  6. Step 6: Final answer
    x = 1,027.89

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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.