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Finding the Fourth Proportional to 1,278.89, 1,918.23 and 354.38

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Solution

The fourth proportional to 1,278.89, 1,918.23 and 354.38 is: 531.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.89 : 1,918.23 = 354.38 : x
  2. Step 2: Convert to fraction form
    1,278.89/1,918.23 = 354.38/x
  3. Step 3: Cross multiply
    1,278.89x = 1,918.23 × 354.38
  4. Step 4: Simplify right side
    1,278.89x = 679,782.35
  5. Step 5: Solve for x
    x = 679,782.35/1,278.89
  6. Step 6: Final answer
    x = 531.54

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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.