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Finding the Fourth Proportional to 1,336.72, 2,005.80 and 515.56

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Solution

The fourth proportional to 1,336.72, 2,005.80 and 515.56 is: 773.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,336.72 : 2,005.80 = 515.56 : x
  2. Step 2: Convert to fraction form
    1,336.72/2,005.80 = 515.56/x
  3. Step 3: Cross multiply
    1,336.72x = 2,005.80 × 515.56
  4. Step 4: Simplify right side
    1,336.72x = 1,034,110.25
  5. Step 5: Solve for x
    x = 1,034,110.25/1,336.72
  6. Step 6: Final answer
    x = 773.62

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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.