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Finding the Fourth Proportional to 1,203.93, 1,661.40 and 672.80

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Solution

The fourth proportional to 1,203.93, 1,661.40 and 672.80 is: 928.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,203.93 : 1,661.40 = 672.80 : x
  2. Step 2: Convert to fraction form
    1,203.93/1,661.40 = 672.80/x
  3. Step 3: Cross multiply
    1,203.93x = 1,661.40 × 672.80
  4. Step 4: Simplify right side
    1,203.93x = 1,117,781.61
  5. Step 5: Solve for x
    x = 1,117,781.61/1,203.93
  6. Step 6: Final answer
    x = 928.44

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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.