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Finding the Fourth Proportional to 961.86, 1,326.74 and 765.84

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Solution

The fourth proportional to 961.86, 1,326.74 and 765.84 is: 1,056.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.86 : 1,326.74 = 765.84 : x
  2. Step 2: Convert to fraction form
    961.86/1,326.74 = 765.84/x
  3. Step 3: Cross multiply
    961.86x = 1,326.74 × 765.84
  4. Step 4: Simplify right side
    961.86x = 1,016,070.56
  5. Step 5: Solve for x
    x = 1,016,070.56/961.86
  6. Step 6: Final answer
    x = 1,056.36

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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.