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Finding the Fourth Proportional to 874.80, 1,311.94 and 258.49

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Solution

The fourth proportional to 874.80, 1,311.94 and 258.49 is: 387.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.80 : 1,311.94 = 258.49 : x
  2. Step 2: Convert to fraction form
    874.80/1,311.94 = 258.49/x
  3. Step 3: Cross multiply
    874.80x = 1,311.94 × 258.49
  4. Step 4: Simplify right side
    874.80x = 339,123.37
  5. Step 5: Solve for x
    x = 339,123.37/874.80
  6. Step 6: Final answer
    x = 387.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.