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Finding the Fourth Proportional to 1,292.06, 1,783.20 and 768.09

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Solution

The fourth proportional to 1,292.06, 1,783.20 and 768.09 is: 1,060.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.06 : 1,783.20 = 768.09 : x
  2. Step 2: Convert to fraction form
    1,292.06/1,783.20 = 768.09/x
  3. Step 3: Cross multiply
    1,292.06x = 1,783.20 × 768.09
  4. Step 4: Simplify right side
    1,292.06x = 1,369,667.66
  5. Step 5: Solve for x
    x = 1,369,667.66/1,292.06
  6. Step 6: Final answer
    x = 1,060.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.