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Finding the Fourth Proportional to 1,279.28, 1,917.30 and 662.88

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Solution

The fourth proportional to 1,279.28, 1,917.30 and 662.88 is: 993.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.28 : 1,917.30 = 662.88 : x
  2. Step 2: Convert to fraction form
    1,279.28/1,917.30 = 662.88/x
  3. Step 3: Cross multiply
    1,279.28x = 1,917.30 × 662.88
  4. Step 4: Simplify right side
    1,279.28x = 1,270,939.82
  5. Step 5: Solve for x
    x = 1,270,939.82/1,279.28
  6. Step 6: Final answer
    x = 993.48

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1.5x scale

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.