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Finding the Fourth Proportional to 851.20, 1,276.50 and 303.30

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Solution

The fourth proportional to 851.20, 1,276.50 and 303.30 is: 454.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.20 : 1,276.50 = 303.30 : x
  2. Step 2: Convert to fraction form
    851.20/1,276.50 = 303.30/x
  3. Step 3: Cross multiply
    851.20x = 1,276.50 × 303.30
  4. Step 4: Simplify right side
    851.20x = 387,162.45
  5. Step 5: Solve for x
    x = 387,162.45/851.20
  6. Step 6: Final answer
    x = 454.84

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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.