Home / 30,969.12-42,772.26-20,939.04

Finding the Fourth Proportional to 30,969.12, 42,772.26 and 20,939.04

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Solution

The fourth proportional to 30,969.12, 42,772.26 and 20,939.04 is: 28,919.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,969.12 : 42,772.26 = 20,939.04 : x
  2. Step 2: Convert to fraction form
    30,969.12/42,772.26 = 20,939.04/x
  3. Step 3: Cross multiply
    30,969.12x = 42,772.26 × 20,939.04
  4. Step 4: Simplify right side
    30,969.12x = 895,610,063.03
  5. Step 5: Solve for x
    x = 895,610,063.03/30,969.12
  6. Step 6: Final answer
    x = 28,919.45

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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.