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Finding the Fourth Proportional to 1,805.72, 2,709.36 and 636.56

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Solution

The fourth proportional to 1,805.72, 2,709.36 and 636.56 is: 955.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,805.72 : 2,709.36 = 636.56 : x
  2. Step 2: Convert to fraction form
    1,805.72/2,709.36 = 636.56/x
  3. Step 3: Cross multiply
    1,805.72x = 2,709.36 × 636.56
  4. Step 4: Simplify right side
    1,805.72x = 1,724,670.20
  5. Step 5: Solve for x
    x = 1,724,670.20/1,805.72
  6. Step 6: Final answer
    x = 955.11

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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.