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Finding the Fourth Proportional to 13,875.80, 20,816.40 and 4,015.40

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Solution

The fourth proportional to 13,875.80, 20,816.40 and 4,015.40 is: 6,023.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,875.80 : 20,816.40 = 4,015.40 : x
  2. Step 2: Convert to fraction form
    13,875.80/20,816.40 = 4,015.40/x
  3. Step 3: Cross multiply
    13,875.80x = 20,816.40 × 4,015.40
  4. Step 4: Simplify right side
    13,875.80x = 83,586,172.56
  5. Step 5: Solve for x
    x = 83,586,172.56/13,875.80
  6. Step 6: Final answer
    x = 6,023.88

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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.