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Finding the Fourth Proportional to 1,324.35, 1,986.80 and 776.61

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Solution

The fourth proportional to 1,324.35, 1,986.80 and 776.61 is: 1,165.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,324.35 : 1,986.80 = 776.61 : x
  2. Step 2: Convert to fraction form
    1,324.35/1,986.80 = 776.61/x
  3. Step 3: Cross multiply
    1,324.35x = 1,986.80 × 776.61
  4. Step 4: Simplify right side
    1,324.35x = 1,542,964.86
  5. Step 5: Solve for x
    x = 1,542,964.86/1,324.35
  6. Step 6: Final answer
    x = 1,165.07

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.