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Finding the Fourth Proportional to 1,203.72, 1,661.11 and 672.61

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Solution

The fourth proportional to 1,203.72, 1,661.11 and 672.61 is: 928.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,203.72 : 1,661.11 = 672.61 : x
  2. Step 2: Convert to fraction form
    1,203.72/1,661.11 = 672.61/x
  3. Step 3: Cross multiply
    1,203.72x = 1,661.11 × 672.61
  4. Step 4: Simplify right side
    1,203.72x = 1,117,271.68
  5. Step 5: Solve for x
    x = 1,117,271.68/1,203.72
  6. Step 6: Final answer
    x = 928.19

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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.