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Finding the Fourth Proportional to 879.45, 1,213.72 and 486.55

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Solution

The fourth proportional to 879.45, 1,213.72 and 486.55 is: 671.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.45 : 1,213.72 = 486.55 : x
  2. Step 2: Convert to fraction form
    879.45/1,213.72 = 486.55/x
  3. Step 3: Cross multiply
    879.45x = 1,213.72 × 486.55
  4. Step 4: Simplify right side
    879.45x = 590,533.04
  5. Step 5: Solve for x
    x = 590,533.04/879.45
  6. Step 6: Final answer
    x = 671.48

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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.