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Finding the Fourth Proportional to 851.76, 1,278.15 and 364.80

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Solution

The fourth proportional to 851.76, 1,278.15 and 364.80 is: 547.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.76 : 1,278.15 = 364.80 : x
  2. Step 2: Convert to fraction form
    851.76/1,278.15 = 364.80/x
  3. Step 3: Cross multiply
    851.76x = 1,278.15 × 364.80
  4. Step 4: Simplify right side
    851.76x = 466,269.12
  5. Step 5: Solve for x
    x = 466,269.12/851.76
  6. Step 6: Final answer
    x = 547.42

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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.