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Finding the Fourth Proportional to 1,077.28, 1,615.91 and 769.27

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Solution

The fourth proportional to 1,077.28, 1,615.91 and 769.27 is: 1,153.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,077.28 : 1,615.91 = 769.27 : x
  2. Step 2: Convert to fraction form
    1,077.28/1,615.91 = 769.27/x
  3. Step 3: Cross multiply
    1,077.28x = 1,615.91 × 769.27
  4. Step 4: Simplify right side
    1,077.28x = 1,243,071.09
  5. Step 5: Solve for x
    x = 1,243,071.09/1,077.28
  6. Step 6: Final answer
    x = 1,153.90

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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.