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Finding the Fourth Proportional to 851.67, 1,277.55 and 303.91

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Solution

The fourth proportional to 851.67, 1,277.55 and 303.91 is: 455.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.67 : 1,277.55 = 303.91 : x
  2. Step 2: Convert to fraction form
    851.67/1,277.55 = 303.91/x
  3. Step 3: Cross multiply
    851.67x = 1,277.55 × 303.91
  4. Step 4: Simplify right side
    851.67x = 388,260.22
  5. Step 5: Solve for x
    x = 388,260.22/851.67
  6. Step 6: Final answer
    x = 455.88

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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.