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Finding the Fourth Proportional to 851.82, 1,278.28 and 543.90

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Solution

The fourth proportional to 851.82, 1,278.28 and 543.90 is: 816.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.82 : 1,278.28 = 543.90 : x
  2. Step 2: Convert to fraction form
    851.82/1,278.28 = 543.90/x
  3. Step 3: Cross multiply
    851.82x = 1,278.28 × 543.90
  4. Step 4: Simplify right side
    851.82x = 695,256.49
  5. Step 5: Solve for x
    x = 695,256.49/851.82
  6. Step 6: Final answer
    x = 816.20

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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.