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Finding the Fourth Proportional to 18,908.86, 28,363.30 and 5,057.50

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Solution

The fourth proportional to 18,908.86, 28,363.30 and 5,057.50 is: 7,586.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,908.86 : 28,363.30 = 5,057.50 : x
  2. Step 2: Convert to fraction form
    18,908.86/28,363.30 = 5,057.50/x
  3. Step 3: Cross multiply
    18,908.86x = 28,363.30 × 5,057.50
  4. Step 4: Simplify right side
    18,908.86x = 143,447,389.75
  5. Step 5: Solve for x
    x = 143,447,389.75/18,908.86
  6. Step 6: Final answer
    x = 7,586.25

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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.