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Finding the Fourth Proportional to 859.75, 1,289.88 and 494.80

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Solution

The fourth proportional to 859.75, 1,289.88 and 494.80 is: 742.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.75 : 1,289.88 = 494.80 : x
  2. Step 2: Convert to fraction form
    859.75/1,289.88 = 494.80/x
  3. Step 3: Cross multiply
    859.75x = 1,289.88 × 494.80
  4. Step 4: Simplify right side
    859.75x = 638,232.62
  5. Step 5: Solve for x
    x = 638,232.62/859.75
  6. Step 6: Final answer
    x = 742.35

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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.