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Finding the Fourth Proportional to 1,282.13, 1,921.58 and 665.99

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Solution

The fourth proportional to 1,282.13, 1,921.58 and 665.99 is: 998.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,282.13 : 1,921.58 = 665.99 : x
  2. Step 2: Convert to fraction form
    1,282.13/1,921.58 = 665.99/x
  3. Step 3: Cross multiply
    1,282.13x = 1,921.58 × 665.99
  4. Step 4: Simplify right side
    1,282.13x = 1,279,749.73
  5. Step 5: Solve for x
    x = 1,279,749.73/1,282.13
  6. Step 6: Final answer
    x = 998.14

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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.