Home / 30,517.78-42,119.52-20,949.76

Finding the Fourth Proportional to 30,517.78, 42,119.52 and 20,949.76

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Solution

The fourth proportional to 30,517.78, 42,119.52 and 20,949.76 is: 28,914.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,517.78 : 42,119.52 = 20,949.76 : x
  2. Step 2: Convert to fraction form
    30,517.78/42,119.52 = 20,949.76/x
  3. Step 3: Cross multiply
    30,517.78x = 42,119.52 × 20,949.76
  4. Step 4: Simplify right side
    30,517.78x = 882,393,835.32
  5. Step 5: Solve for x
    x = 882,393,835.32/30,517.78
  6. Step 6: Final answer
    x = 28,914.09

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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.