Home / 30,776.91-42,443.95-20,172.39

Finding the Fourth Proportional to 30,776.91, 42,443.95 and 20,172.39

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Solution

The fourth proportional to 30,776.91, 42,443.95 and 20,172.39 is: 27,819.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,776.91 : 42,443.95 = 20,172.39 : x
  2. Step 2: Convert to fraction form
    30,776.91/42,443.95 = 20,172.39/x
  3. Step 3: Cross multiply
    30,776.91x = 42,443.95 × 20,172.39
  4. Step 4: Simplify right side
    30,776.91x = 856,195,912.54
  5. Step 5: Solve for x
    x = 856,195,912.54/30,776.91
  6. Step 6: Final answer
    x = 27,819.42

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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.