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Finding the Fourth Proportional to 1,203.75, 1,661.18 and 679.91

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Solution

The fourth proportional to 1,203.75, 1,661.18 and 679.91 is: 938.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,203.75 : 1,661.18 = 679.91 : x
  2. Step 2: Convert to fraction form
    1,203.75/1,661.18 = 679.91/x
  3. Step 3: Cross multiply
    1,203.75x = 1,661.18 × 679.91
  4. Step 4: Simplify right side
    1,203.75x = 1,129,452.89
  5. Step 5: Solve for x
    x = 1,129,452.89/1,203.75
  6. Step 6: Final answer
    x = 938.28

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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.