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Finding the Fourth Proportional to 879.23, 1,213.24 and 486.15

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Solution

The fourth proportional to 879.23, 1,213.24 and 486.15 is: 670.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.23 : 1,213.24 = 486.15 : x
  2. Step 2: Convert to fraction form
    879.23/1,213.24 = 486.15/x
  3. Step 3: Cross multiply
    879.23x = 1,213.24 × 486.15
  4. Step 4: Simplify right side
    879.23x = 589,816.63
  5. Step 5: Solve for x
    x = 589,816.63/879.23
  6. Step 6: Final answer
    x = 670.83

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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.