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Finding the Fourth Proportional to 20,406.56, 30,612 and 7,260.16

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Solution

The fourth proportional to 20,406.56, 30,612 and 7,260.16 is: 10,891.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,406.56 : 30,612 = 7,260.16 : x
  2. Step 2: Convert to fraction form
    20,406.56/30,612 = 7,260.16/x
  3. Step 3: Cross multiply
    20,406.56x = 30,612 × 7,260.16
  4. Step 4: Simplify right side
    20,406.56x = 222,248,017.92
  5. Step 5: Solve for x
    x = 222,248,017.92/20,406.56
  6. Step 6: Final answer
    x = 10,891.01

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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.