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Finding the Fourth Proportional to 1,008.88, 1,391.60 and 672.80

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Solution

The fourth proportional to 1,008.88, 1,391.60 and 672.80 is: 928.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.88 : 1,391.60 = 672.80 : x
  2. Step 2: Convert to fraction form
    1,008.88/1,391.60 = 672.80/x
  3. Step 3: Cross multiply
    1,008.88x = 1,391.60 × 672.80
  4. Step 4: Simplify right side
    1,008.88x = 936,268.48
  5. Step 5: Solve for x
    x = 936,268.48/1,008.88
  6. Step 6: Final answer
    x = 928.03

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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.