Home / 30,899.39-42,644.88-20,155.73

Finding the Fourth Proportional to 30,899.39, 42,644.88 and 20,155.73

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Solution

The fourth proportional to 30,899.39, 42,644.88 and 20,155.73 is: 27,817.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,899.39 : 42,644.88 = 20,155.73 : x
  2. Step 2: Convert to fraction form
    30,899.39/42,644.88 = 20,155.73/x
  3. Step 3: Cross multiply
    30,899.39x = 42,644.88 × 20,155.73
  4. Step 4: Simplify right side
    30,899.39x = 859,538,473.94
  5. Step 5: Solve for x
    x = 859,538,473.94/30,899.39
  6. Step 6: Final answer
    x = 27,817.33

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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.