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Finding the Fourth Proportional to 773.81, 1,160.90 and 260.81

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Solution

The fourth proportional to 773.81, 1,160.90 and 260.81 is: 391.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    773.81 : 1,160.90 = 260.81 : x
  2. Step 2: Convert to fraction form
    773.81/1,160.90 = 260.81/x
  3. Step 3: Cross multiply
    773.81x = 1,160.90 × 260.81
  4. Step 4: Simplify right side
    773.81x = 302,776.91
  5. Step 5: Solve for x
    x = 302,776.91/773.81
  6. Step 6: Final answer
    x = 391.28

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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.