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Finding the Fourth Proportional to 859.89, 1,287.89 and 547.54

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Solution

The fourth proportional to 859.89, 1,287.89 and 547.54 is: 820.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.89 : 1,287.89 = 547.54 : x
  2. Step 2: Convert to fraction form
    859.89/1,287.89 = 547.54/x
  3. Step 3: Cross multiply
    859.89x = 1,287.89 × 547.54
  4. Step 4: Simplify right side
    859.89x = 705,171.29
  5. Step 5: Solve for x
    x = 705,171.29/859.89
  6. Step 6: Final answer
    x = 820.07

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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.