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Finding the Fourth Proportional to 879.17, 1,319.53 and 685.41

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Solution

The fourth proportional to 879.17, 1,319.53 and 685.41 is: 1,028.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.17 : 1,319.53 = 685.41 : x
  2. Step 2: Convert to fraction form
    879.17/1,319.53 = 685.41/x
  3. Step 3: Cross multiply
    879.17x = 1,319.53 × 685.41
  4. Step 4: Simplify right side
    879.17x = 904,419.06
  5. Step 5: Solve for x
    x = 904,419.06/879.17
  6. Step 6: Final answer
    x = 1,028.72

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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.