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Finding the Fourth Proportional to 1,270.72, 1,902.84 and 619.75

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Solution

The fourth proportional to 1,270.72, 1,902.84 and 619.75 is: 928.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.72 : 1,902.84 = 619.75 : x
  2. Step 2: Convert to fraction form
    1,270.72/1,902.84 = 619.75/x
  3. Step 3: Cross multiply
    1,270.72x = 1,902.84 × 619.75
  4. Step 4: Simplify right side
    1,270.72x = 1,179,285.09
  5. Step 5: Solve for x
    x = 1,179,285.09/1,270.72
  6. Step 6: Final answer
    x = 928.04

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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.