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Finding the Fourth Proportional to 1,170.43, 1,615 and 672.88

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Solution

The fourth proportional to 1,170.43, 1,615 and 672.88 is: 928.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,170.43 : 1,615 = 672.88 : x
  2. Step 2: Convert to fraction form
    1,170.43/1,615 = 672.88/x
  3. Step 3: Cross multiply
    1,170.43x = 1,615 × 672.88
  4. Step 4: Simplify right side
    1,170.43x = 1,086,701.20
  5. Step 5: Solve for x
    x = 1,086,701.20/1,170.43
  6. Step 6: Final answer
    x = 928.46

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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.