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Finding the Fourth Proportional to 1,278.73, 1,916.88 and 729.86

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Solution

The fourth proportional to 1,278.73, 1,916.88 and 729.86 is: 1,094.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.73 : 1,916.88 = 729.86 : x
  2. Step 2: Convert to fraction form
    1,278.73/1,916.88 = 729.86/x
  3. Step 3: Cross multiply
    1,278.73x = 1,916.88 × 729.86
  4. Step 4: Simplify right side
    1,278.73x = 1,399,041.72
  5. Step 5: Solve for x
    x = 1,399,041.72/1,278.73
  6. Step 6: Final answer
    x = 1,094.09

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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.