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Finding the Fourth Proportional to 6,409.28, 9,612 and 1,791.68

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Solution

The fourth proportional to 6,409.28, 9,612 and 1,791.68 is: 2,686.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,409.28 : 9,612 = 1,791.68 : x
  2. Step 2: Convert to fraction form
    6,409.28/9,612 = 1,791.68/x
  3. Step 3: Cross multiply
    6,409.28x = 9,612 × 1,791.68
  4. Step 4: Simplify right side
    6,409.28x = 17,221,628.16
  5. Step 5: Solve for x
    x = 17,221,628.16/6,409.28
  6. Step 6: Final answer
    x = 2,686.98

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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.