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Finding the Fourth Proportional to 859.30, 1,186.49 and 672.46

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Solution

The fourth proportional to 859.30, 1,186.49 and 672.46 is: 928.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.30 : 1,186.49 = 672.46 : x
  2. Step 2: Convert to fraction form
    859.30/1,186.49 = 672.46/x
  3. Step 3: Cross multiply
    859.30x = 1,186.49 × 672.46
  4. Step 4: Simplify right side
    859.30x = 797,865.78
  5. Step 5: Solve for x
    x = 797,865.78/859.30
  6. Step 6: Final answer
    x = 928.51

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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.