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Finding the Fourth Proportional to 1,292.59, 1,783.92 and 768.79

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Solution

The fourth proportional to 1,292.59, 1,783.92 and 768.79 is: 1,061.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.59 : 1,783.92 = 768.79 : x
  2. Step 2: Convert to fraction form
    1,292.59/1,783.92 = 768.79/x
  3. Step 3: Cross multiply
    1,292.59x = 1,783.92 × 768.79
  4. Step 4: Simplify right side
    1,292.59x = 1,371,459.86
  5. Step 5: Solve for x
    x = 1,371,459.86/1,292.59
  6. Step 6: Final answer
    x = 1,061.02

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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.