Home / 1,279.09-1,918.33-457.34

Finding the Fourth Proportional to 1,279.09, 1,918.33 and 457.34

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Solution

The fourth proportional to 1,279.09, 1,918.33 and 457.34 is: 685.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.09 : 1,918.33 = 457.34 : x
  2. Step 2: Convert to fraction form
    1,279.09/1,918.33 = 457.34/x
  3. Step 3: Cross multiply
    1,279.09x = 1,918.33 × 457.34
  4. Step 4: Simplify right side
    1,279.09x = 877,329.04
  5. Step 5: Solve for x
    x = 877,329.04/1,279.09
  6. Step 6: Final answer
    x = 685.90

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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.