Home / 1,418.19-2,127.57-687.36

Finding the Fourth Proportional to 1,418.19, 2,127.57 and 687.36

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Solution

The fourth proportional to 1,418.19, 2,127.57 and 687.36 is: 1,031.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,418.19 : 2,127.57 = 687.36 : x
  2. Step 2: Convert to fraction form
    1,418.19/2,127.57 = 687.36/x
  3. Step 3: Cross multiply
    1,418.19x = 2,127.57 × 687.36
  4. Step 4: Simplify right side
    1,418.19x = 1,462,406.52
  5. Step 5: Solve for x
    x = 1,462,406.52/1,418.19
  6. Step 6: Final answer
    x = 1,031.18

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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.