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Finding the Fourth Proportional to 1,203.55, 1,660.91 and 672.43

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Solution

The fourth proportional to 1,203.55, 1,660.91 and 672.43 is: 927.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,203.55 : 1,660.91 = 672.43 : x
  2. Step 2: Convert to fraction form
    1,203.55/1,660.91 = 672.43/x
  3. Step 3: Cross multiply
    1,203.55x = 1,660.91 × 672.43
  4. Step 4: Simplify right side
    1,203.55x = 1,116,836.64
  5. Step 5: Solve for x
    x = 1,116,836.64/1,203.55
  6. Step 6: Final answer
    x = 927.95

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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.