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Finding the Fourth Proportional to 879.19, 1,213.86 and 548.08

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Solution

The fourth proportional to 879.19, 1,213.86 and 548.08 is: 756.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.19 : 1,213.86 = 548.08 : x
  2. Step 2: Convert to fraction form
    879.19/1,213.86 = 548.08/x
  3. Step 3: Cross multiply
    879.19x = 1,213.86 × 548.08
  4. Step 4: Simplify right side
    879.19x = 665,292.39
  5. Step 5: Solve for x
    x = 665,292.39/879.19
  6. Step 6: Final answer
    x = 756.71

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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.