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Finding the Fourth Proportional to 1,278.95, 1,918.43 and 354.58

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Solution

The fourth proportional to 1,278.95, 1,918.43 and 354.58 is: 531.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.95 : 1,918.43 = 354.58 : x
  2. Step 2: Convert to fraction form
    1,278.95/1,918.43 = 354.58/x
  3. Step 3: Cross multiply
    1,278.95x = 1,918.43 × 354.58
  4. Step 4: Simplify right side
    1,278.95x = 680,236.91
  5. Step 5: Solve for x
    x = 680,236.91/1,278.95
  6. Step 6: Final answer
    x = 531.87

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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.