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Finding the Fourth Proportional to 20,262, 30,388.32 and 7,777.92

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Solution

The fourth proportional to 20,262, 30,388.32 and 7,777.92 is: 11,665.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,262 : 30,388.32 = 7,777.92 : x
  2. Step 2: Convert to fraction form
    20,262/30,388.32 = 7,777.92/x
  3. Step 3: Cross multiply
    20,262x = 30,388.32 × 7,777.92
  4. Step 4: Simplify right side
    20,262x = 236,357,921.89
  5. Step 5: Solve for x
    x = 236,357,921.89/20,262
  6. Step 6: Final answer
    x = 11,665.08

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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.