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Finding the Fourth Proportional to 1,278.98, 1,918.25 and 354.63

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Solution

The fourth proportional to 1,278.98, 1,918.25 and 354.63 is: 531.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.98 : 1,918.25 = 354.63 : x
  2. Step 2: Convert to fraction form
    1,278.98/1,918.25 = 354.63/x
  3. Step 3: Cross multiply
    1,278.98x = 1,918.25 × 354.63
  4. Step 4: Simplify right side
    1,278.98x = 680,269.88
  5. Step 5: Solve for x
    x = 680,269.88/1,278.98
  6. Step 6: Final answer
    x = 531.89

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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.