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Finding the Fourth Proportional to 879.12, 1,212.84 and 547.38

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Solution

The fourth proportional to 879.12, 1,212.84 and 547.38 is: 755.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.12 : 1,212.84 = 547.38 : x
  2. Step 2: Convert to fraction form
    879.12/1,212.84 = 547.38/x
  3. Step 3: Cross multiply
    879.12x = 1,212.84 × 547.38
  4. Step 4: Simplify right side
    879.12x = 663,884.36
  5. Step 5: Solve for x
    x = 663,884.36/879.12
  6. Step 6: Final answer
    x = 755.17

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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.