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Finding the Fourth Proportional to 879.49, 1,213.77 and 486.60

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Solution

The fourth proportional to 879.49, 1,213.77 and 486.60 is: 671.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.49 : 1,213.77 = 486.60 : x
  2. Step 2: Convert to fraction form
    879.49/1,213.77 = 486.60/x
  3. Step 3: Cross multiply
    879.49x = 1,213.77 × 486.60
  4. Step 4: Simplify right side
    879.49x = 590,620.48
  5. Step 5: Solve for x
    x = 590,620.48/879.49
  6. Step 6: Final answer
    x = 671.55

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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.