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Finding the Fourth Proportional to 859.15, 1,287.82 and 624.33

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Solution

The fourth proportional to 859.15, 1,287.82 and 624.33 is: 935.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.15 : 1,287.82 = 624.33 : x
  2. Step 2: Convert to fraction form
    859.15/1,287.82 = 624.33/x
  3. Step 3: Cross multiply
    859.15x = 1,287.82 × 624.33
  4. Step 4: Simplify right side
    859.15x = 804,024.66
  5. Step 5: Solve for x
    x = 804,024.66/859.15
  6. Step 6: Final answer
    x = 935.84

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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.