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Finding the Fourth Proportional to 1,292.94, 1,784.66 and 768.87

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Solution

The fourth proportional to 1,292.94, 1,784.66 and 768.87 is: 1,061.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.94 : 1,784.66 = 768.87 : x
  2. Step 2: Convert to fraction form
    1,292.94/1,784.66 = 768.87/x
  3. Step 3: Cross multiply
    1,292.94x = 1,784.66 × 768.87
  4. Step 4: Simplify right side
    1,292.94x = 1,372,171.53
  5. Step 5: Solve for x
    x = 1,372,171.53/1,292.94
  6. Step 6: Final answer
    x = 1,061.28

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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.