Home / 11,419.28-15,760.68-6,639.90

Finding the Fourth Proportional to 11,419.28, 15,760.68 and 6,639.90

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Solution

The fourth proportional to 11,419.28, 15,760.68 and 6,639.90 is: 9,164.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,419.28 : 15,760.68 = 6,639.90 : x
  2. Step 2: Convert to fraction form
    11,419.28/15,760.68 = 6,639.90/x
  3. Step 3: Cross multiply
    11,419.28x = 15,760.68 × 6,639.90
  4. Step 4: Simplify right side
    11,419.28x = 104,649,339.13
  5. Step 5: Solve for x
    x = 104,649,339.13/11,419.28
  6. Step 6: Final answer
    x = 9,164.27

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.