Home / 21,007.68-31,513.28-5,425.60

Finding the Fourth Proportional to 21,007.68, 31,513.28 and 5,425.60

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Solution

The fourth proportional to 21,007.68, 31,513.28 and 5,425.60 is: 8,138.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,007.68 : 31,513.28 = 5,425.60 : x
  2. Step 2: Convert to fraction form
    21,007.68/31,513.28 = 5,425.60/x
  3. Step 3: Cross multiply
    21,007.68x = 31,513.28 × 5,425.60
  4. Step 4: Simplify right side
    21,007.68x = 170,978,451.97
  5. Step 5: Solve for x
    x = 170,978,451.97/21,007.68
  6. Step 6: Final answer
    x = 8,138.85

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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.