Home / 1,279.28-1,918.82-354.87

Finding the Fourth Proportional to 1,279.28, 1,918.82 and 354.87

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Solution

The fourth proportional to 1,279.28, 1,918.82 and 354.87 is: 532.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.28 : 1,918.82 = 354.87 : x
  2. Step 2: Convert to fraction form
    1,279.28/1,918.82 = 354.87/x
  3. Step 3: Cross multiply
    1,279.28x = 1,918.82 × 354.87
  4. Step 4: Simplify right side
    1,279.28x = 680,929.88
  5. Step 5: Solve for x
    x = 680,929.88/1,279.28
  6. Step 6: Final answer
    x = 532.28

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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.