Home / 1,279.90-1,919.94-458.08

Finding the Fourth Proportional to 1,279.90, 1,919.94 and 458.08

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Solution

The fourth proportional to 1,279.90, 1,919.94 and 458.08 is: 687.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.90 : 1,919.94 = 458.08 : x
  2. Step 2: Convert to fraction form
    1,279.90/1,919.94 = 458.08/x
  3. Step 3: Cross multiply
    1,279.90x = 1,919.94 × 458.08
  4. Step 4: Simplify right side
    1,279.90x = 879,486.12
  5. Step 5: Solve for x
    x = 879,486.12/1,279.90
  6. Step 6: Final answer
    x = 687.15

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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.