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Finding the Fourth Proportional to 851.56, 1,276.94 and 303.40

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Solution

The fourth proportional to 851.56, 1,276.94 and 303.40 is: 454.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.56 : 1,276.94 = 303.40 : x
  2. Step 2: Convert to fraction form
    851.56/1,276.94 = 303.40/x
  3. Step 3: Cross multiply
    851.56x = 1,276.94 × 303.40
  4. Step 4: Simplify right side
    851.56x = 387,423.60
  5. Step 5: Solve for x
    x = 387,423.60/851.56
  6. Step 6: Final answer
    x = 454.96

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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.