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Finding the Fourth Proportional to 1,278.72, 1,918.08 and 792

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Solution

The fourth proportional to 1,278.72, 1,918.08 and 792 is: 1,188.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.72 : 1,918.08 = 792 : x
  2. Step 2: Convert to fraction form
    1,278.72/1,918.08 = 792/x
  3. Step 3: Cross multiply
    1,278.72x = 1,918.08 × 792
  4. Step 4: Simplify right side
    1,278.72x = 1,519,119.36
  5. Step 5: Solve for x
    x = 1,519,119.36/1,278.72
  6. Step 6: Final answer
    x = 1,188.00

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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.