Home / 20,891.28-31,336.80-5,310.12

Finding the Fourth Proportional to 20,891.28, 31,336.80 and 5,310.12

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Solution

The fourth proportional to 20,891.28, 31,336.80 and 5,310.12 is: 7,965.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,891.28 : 31,336.80 = 5,310.12 : x
  2. Step 2: Convert to fraction form
    20,891.28/31,336.80 = 5,310.12/x
  3. Step 3: Cross multiply
    20,891.28x = 31,336.80 × 5,310.12
  4. Step 4: Simplify right side
    20,891.28x = 166,402,168.42
  5. Step 5: Solve for x
    x = 166,402,168.42/20,891.28
  6. Step 6: Final answer
    x = 7,965.15

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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.