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Finding the Fourth Proportional to 1,203.69, 1,805.57 and 618.53

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Solution

The fourth proportional to 1,203.69, 1,805.57 and 618.53 is: 927.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,203.69 : 1,805.57 = 618.53 : x
  2. Step 2: Convert to fraction form
    1,203.69/1,805.57 = 618.53/x
  3. Step 3: Cross multiply
    1,203.69x = 1,805.57 × 618.53
  4. Step 4: Simplify right side
    1,203.69x = 1,116,799.21
  5. Step 5: Solve for x
    x = 1,116,799.21/1,203.69
  6. Step 6: Final answer
    x = 927.81

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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.