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Finding the Fourth Proportional to 879.03, 1,212.66 and 617.40

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Solution

The fourth proportional to 879.03, 1,212.66 and 617.40 is: 851.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.03 : 1,212.66 = 617.40 : x
  2. Step 2: Convert to fraction form
    879.03/1,212.66 = 617.40/x
  3. Step 3: Cross multiply
    879.03x = 1,212.66 × 617.40
  4. Step 4: Simplify right side
    879.03x = 748,696.28
  5. Step 5: Solve for x
    x = 748,696.28/879.03
  6. Step 6: Final answer
    x = 851.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.