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Finding the Fourth Proportional to 859.29, 1,287.72 and 494.19

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Solution

The fourth proportional to 859.29, 1,287.72 and 494.19 is: 740.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.29 : 1,287.72 = 494.19 : x
  2. Step 2: Convert to fraction form
    859.29/1,287.72 = 494.19/x
  3. Step 3: Cross multiply
    859.29x = 1,287.72 × 494.19
  4. Step 4: Simplify right side
    859.29x = 636,378.35
  5. Step 5: Solve for x
    x = 636,378.35/859.29
  6. Step 6: Final answer
    x = 740.59

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.