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Finding the Fourth Proportional to 1,281.56, 1,923.38 and 665.44

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Solution

The fourth proportional to 1,281.56, 1,923.38 and 665.44 is: 998.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.56 : 1,923.38 = 665.44 : x
  2. Step 2: Convert to fraction form
    1,281.56/1,923.38 = 665.44/x
  3. Step 3: Cross multiply
    1,281.56x = 1,923.38 × 665.44
  4. Step 4: Simplify right side
    1,281.56x = 1,279,889.18
  5. Step 5: Solve for x
    x = 1,279,889.18/1,281.56
  6. Step 6: Final answer
    x = 998.70

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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.