Home / 1,418.39-2,128.14-638.18

Finding the Fourth Proportional to 1,418.39, 2,128.14 and 638.18

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Solution

The fourth proportional to 1,418.39, 2,128.14 and 638.18 is: 957.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,418.39 : 2,128.14 = 638.18 : x
  2. Step 2: Convert to fraction form
    1,418.39/2,128.14 = 638.18/x
  3. Step 3: Cross multiply
    1,418.39x = 2,128.14 × 638.18
  4. Step 4: Simplify right side
    1,418.39x = 1,358,136.39
  5. Step 5: Solve for x
    x = 1,358,136.39/1,418.39
  6. Step 6: Final answer
    x = 957.52

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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.