Home / 20,128.28-30,182.71-8,438.36

Finding the Fourth Proportional to 20,128.28, 30,182.71 and 8,438.36

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Solution

The fourth proportional to 20,128.28, 30,182.71 and 8,438.36 is: 12,653.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,128.28 : 30,182.71 = 8,438.36 : x
  2. Step 2: Convert to fraction form
    20,128.28/30,182.71 = 8,438.36/x
  3. Step 3: Cross multiply
    20,128.28x = 30,182.71 × 8,438.36
  4. Step 4: Simplify right side
    20,128.28x = 254,692,572.76
  5. Step 5: Solve for x
    x = 254,692,572.76/20,128.28
  6. Step 6: Final answer
    x = 12,653.47

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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.