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Finding the Fourth Proportional to 1,203.86, 1,661.32 and 679.89

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Solution

The fourth proportional to 1,203.86, 1,661.32 and 679.89 is: 938.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,203.86 : 1,661.32 = 679.89 : x
  2. Step 2: Convert to fraction form
    1,203.86/1,661.32 = 679.89/x
  3. Step 3: Cross multiply
    1,203.86x = 1,661.32 × 679.89
  4. Step 4: Simplify right side
    1,203.86x = 1,129,514.85
  5. Step 5: Solve for x
    x = 1,129,514.85/1,203.86
  6. Step 6: Final answer
    x = 938.24

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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.