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Finding the Fourth Proportional to 1,279.74, 1,919.60 and 846.80

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Solution

The fourth proportional to 1,279.74, 1,919.60 and 846.80 is: 1,270.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.74 : 1,919.60 = 846.80 : x
  2. Step 2: Convert to fraction form
    1,279.74/1,919.60 = 846.80/x
  3. Step 3: Cross multiply
    1,279.74x = 1,919.60 × 846.80
  4. Step 4: Simplify right side
    1,279.74x = 1,625,517.28
  5. Step 5: Solve for x
    x = 1,625,517.28/1,279.74
  6. Step 6: Final answer
    x = 1,270.19

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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.