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Finding the Fourth Proportional to 1,203.59, 1,805.58 and 911.49

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Solution

The fourth proportional to 1,203.59, 1,805.58 and 911.49 is: 1,367.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,203.59 : 1,805.58 = 911.49 : x
  2. Step 2: Convert to fraction form
    1,203.59/1,805.58 = 911.49/x
  3. Step 3: Cross multiply
    1,203.59x = 1,805.58 × 911.49
  4. Step 4: Simplify right side
    1,203.59x = 1,645,768.11
  5. Step 5: Solve for x
    x = 1,645,768.11/1,203.59
  6. Step 6: Final answer
    x = 1,367.39

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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.