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Finding the Fourth Proportional to 1,308.72, 1,805.44 and 804.40

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Solution

The fourth proportional to 1,308.72, 1,805.44 and 804.40 is: 1,109.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.72 : 1,805.44 = 804.40 : x
  2. Step 2: Convert to fraction form
    1,308.72/1,805.44 = 804.40/x
  3. Step 3: Cross multiply
    1,308.72x = 1,805.44 × 804.40
  4. Step 4: Simplify right side
    1,308.72x = 1,452,295.94
  5. Step 5: Solve for x
    x = 1,452,295.94/1,308.72
  6. Step 6: Final answer
    x = 1,109.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.