Home / 20,428.81-28,192.83-11,355.15

Finding the Fourth Proportional to 20,428.81, 28,192.83 and 11,355.15

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Solution

The fourth proportional to 20,428.81, 28,192.83 and 11,355.15 is: 15,670.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,428.81 : 28,192.83 = 11,355.15 : x
  2. Step 2: Convert to fraction form
    20,428.81/28,192.83 = 11,355.15/x
  3. Step 3: Cross multiply
    20,428.81x = 28,192.83 × 11,355.15
  4. Step 4: Simplify right side
    20,428.81x = 320,133,876.72
  5. Step 5: Solve for x
    x = 320,133,876.72/20,428.81
  6. Step 6: Final answer
    x = 15,670.71

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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.