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Finding the Fourth Proportional to 18,805.66, 28,203.87 and 7,715.52

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Solution

The fourth proportional to 18,805.66, 28,203.87 and 7,715.52 is: 11,571.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,805.66 : 28,203.87 = 7,715.52 : x
  2. Step 2: Convert to fraction form
    18,805.66/28,203.87 = 7,715.52/x
  3. Step 3: Cross multiply
    18,805.66x = 28,203.87 × 7,715.52
  4. Step 4: Simplify right side
    18,805.66x = 217,607,523.06
  5. Step 5: Solve for x
    x = 217,607,523.06/18,805.66
  6. Step 6: Final answer
    x = 11,571.38

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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.