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Finding the Fourth Proportional to 20,656.56, 30,991.86 and 7,509.99

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Solution

The fourth proportional to 20,656.56, 30,991.86 and 7,509.99 is: 11,267.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,656.56 : 30,991.86 = 7,509.99 : x
  2. Step 2: Convert to fraction form
    20,656.56/30,991.86 = 7,509.99/x
  3. Step 3: Cross multiply
    20,656.56x = 30,991.86 × 7,509.99
  4. Step 4: Simplify right side
    20,656.56x = 232,748,558.68
  5. Step 5: Solve for x
    x = 232,748,558.68/20,656.56
  6. Step 6: Final answer
    x = 11,267.54

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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.