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Finding the Fourth Proportional to 879.22, 1,317.39 and 648.58

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Solution

The fourth proportional to 879.22, 1,317.39 and 648.58 is: 971.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.22 : 1,317.39 = 648.58 : x
  2. Step 2: Convert to fraction form
    879.22/1,317.39 = 648.58/x
  3. Step 3: Cross multiply
    879.22x = 1,317.39 × 648.58
  4. Step 4: Simplify right side
    879.22x = 854,432.81
  5. Step 5: Solve for x
    x = 854,432.81/879.22
  6. Step 6: Final answer
    x = 971.81

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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.