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Finding the Fourth Proportional to 851.88, 1,279.72 and 505.38

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Solution

The fourth proportional to 851.88, 1,279.72 and 505.38 is: 759.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.88 : 1,279.72 = 505.38 : x
  2. Step 2: Convert to fraction form
    851.88/1,279.72 = 505.38/x
  3. Step 3: Cross multiply
    851.88x = 1,279.72 × 505.38
  4. Step 4: Simplify right side
    851.88x = 646,744.89
  5. Step 5: Solve for x
    x = 646,744.89/851.88
  6. Step 6: Final answer
    x = 759.20

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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.