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Finding the Fourth Proportional to 1,279.69, 1,919.78 and 586.38

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Solution

The fourth proportional to 1,279.69, 1,919.78 and 586.38 is: 879.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.69 : 1,919.78 = 586.38 : x
  2. Step 2: Convert to fraction form
    1,279.69/1,919.78 = 586.38/x
  3. Step 3: Cross multiply
    1,279.69x = 1,919.78 × 586.38
  4. Step 4: Simplify right side
    1,279.69x = 1,125,720.60
  5. Step 5: Solve for x
    x = 1,125,720.60/1,279.69
  6. Step 6: Final answer
    x = 879.68

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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.