Home / 1,279.31-1,918.37-457.39

Finding the Fourth Proportional to 1,279.31, 1,918.37 and 457.39

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Solution

The fourth proportional to 1,279.31, 1,918.37 and 457.39 is: 685.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.31 : 1,918.37 = 457.39 : x
  2. Step 2: Convert to fraction form
    1,279.31/1,918.37 = 457.39/x
  3. Step 3: Cross multiply
    1,279.31x = 1,918.37 × 457.39
  4. Step 4: Simplify right side
    1,279.31x = 877,436.17
  5. Step 5: Solve for x
    x = 877,436.17/1,279.31
  6. Step 6: Final answer
    x = 685.87

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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.