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Finding the Fourth Proportional to 851.20, 1,277.18 and 505.19

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Solution

The fourth proportional to 851.20, 1,277.18 and 505.19 is: 758.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.20 : 1,277.18 = 505.19 : x
  2. Step 2: Convert to fraction form
    851.20/1,277.18 = 505.19/x
  3. Step 3: Cross multiply
    851.20x = 1,277.18 × 505.19
  4. Step 4: Simplify right side
    851.20x = 645,218.56
  5. Step 5: Solve for x
    x = 645,218.56/851.20
  6. Step 6: Final answer
    x = 758.01

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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.