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Finding the Fourth Proportional to 1,294.86, 1,786.92 and 763.78

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Solution

The fourth proportional to 1,294.86, 1,786.92 and 763.78 is: 1,054.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,294.86 : 1,786.92 = 763.78 : x
  2. Step 2: Convert to fraction form
    1,294.86/1,786.92 = 763.78/x
  3. Step 3: Cross multiply
    1,294.86x = 1,786.92 × 763.78
  4. Step 4: Simplify right side
    1,294.86x = 1,364,813.76
  5. Step 5: Solve for x
    x = 1,364,813.76/1,294.86
  6. Step 6: Final answer
    x = 1,054.02

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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.