Home / 18,911.73-28,359.38-6,428.40

Finding the Fourth Proportional to 18,911.73, 28,359.38 and 6,428.40

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Solution

The fourth proportional to 18,911.73, 28,359.38 and 6,428.40 is: 9,639.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,911.73 : 28,359.38 = 6,428.40 : x
  2. Step 2: Convert to fraction form
    18,911.73/28,359.38 = 6,428.40/x
  3. Step 3: Cross multiply
    18,911.73x = 28,359.38 × 6,428.40
  4. Step 4: Simplify right side
    18,911.73x = 182,305,348.12
  5. Step 5: Solve for x
    x = 182,305,348.12/18,911.73
  6. Step 6: Final answer
    x = 9,639.80

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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.