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Finding the Fourth Proportional to 20,622.88, 30,934.05 and 5,040.64

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Solution

The fourth proportional to 20,622.88, 30,934.05 and 5,040.64 is: 7,560.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,622.88 : 30,934.05 = 5,040.64 : x
  2. Step 2: Convert to fraction form
    20,622.88/30,934.05 = 5,040.64/x
  3. Step 3: Cross multiply
    20,622.88x = 30,934.05 × 5,040.64
  4. Step 4: Simplify right side
    20,622.88x = 155,927,409.79
  5. Step 5: Solve for x
    x = 155,927,409.79/20,622.88
  6. Step 6: Final answer
    x = 7,560.89

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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.