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Finding the Fourth Proportional to 801.89, 1,200.75 and 687.07

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Solution

The fourth proportional to 801.89, 1,200.75 and 687.07 is: 1,028.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.89 : 1,200.75 = 687.07 : x
  2. Step 2: Convert to fraction form
    801.89/1,200.75 = 687.07/x
  3. Step 3: Cross multiply
    801.89x = 1,200.75 × 687.07
  4. Step 4: Simplify right side
    801.89x = 824,999.30
  5. Step 5: Solve for x
    x = 824,999.30/801.89
  6. Step 6: Final answer
    x = 1,028.82

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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.