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Finding the Fourth Proportional to 11,969.28, 17,948.64 and 6,421.68

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Solution

The fourth proportional to 11,969.28, 17,948.64 and 6,421.68 is: 9,629.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,969.28 : 17,948.64 = 6,421.68 : x
  2. Step 2: Convert to fraction form
    11,969.28/17,948.64 = 6,421.68/x
  3. Step 3: Cross multiply
    11,969.28x = 17,948.64 × 6,421.68
  4. Step 4: Simplify right side
    11,969.28x = 115,260,422.52
  5. Step 5: Solve for x
    x = 115,260,422.52/11,969.28
  6. Step 6: Final answer
    x = 9,629.69

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1.5x scale

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.