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Finding the Fourth Proportional to 13,875, 20,812.50 and 4,147

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Solution

The fourth proportional to 13,875, 20,812.50 and 4,147 is: 6,220.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,875 : 20,812.50 = 4,147 : x
  2. Step 2: Convert to fraction form
    13,875/20,812.50 = 4,147/x
  3. Step 3: Cross multiply
    13,875x = 20,812.50 × 4,147
  4. Step 4: Simplify right side
    13,875x = 86,309,437.50
  5. Step 5: Solve for x
    x = 86,309,437.50/13,875
  6. Step 6: Final answer
    x = 6,220.50

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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.