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Finding the Fourth Proportional to 18,805.86, 28,204.13 and 7,715.64

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Solution

The fourth proportional to 18,805.86, 28,204.13 and 7,715.64 is: 11,571.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,805.86 : 28,204.13 = 7,715.64 : x
  2. Step 2: Convert to fraction form
    18,805.86/28,204.13 = 7,715.64/x
  3. Step 3: Cross multiply
    18,805.86x = 28,204.13 × 7,715.64
  4. Step 4: Simplify right side
    18,805.86x = 217,612,875.02
  5. Step 5: Solve for x
    x = 217,612,875.02/18,805.86
  6. Step 6: Final answer
    x = 11,571.55

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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.