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Finding the Fourth Proportional to 879.83, 1,213.97 and 525.65

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Solution

The fourth proportional to 879.83, 1,213.97 and 525.65 is: 725.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.83 : 1,213.97 = 525.65 : x
  2. Step 2: Convert to fraction form
    879.83/1,213.97 = 525.65/x
  3. Step 3: Cross multiply
    879.83x = 1,213.97 × 525.65
  4. Step 4: Simplify right side
    879.83x = 638,123.33
  5. Step 5: Solve for x
    x = 638,123.33/879.83
  6. Step 6: Final answer
    x = 725.28

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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.