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Finding the Fourth Proportional to 20,559.78, 30,839.64 and 4,977.36

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Solution

The fourth proportional to 20,559.78, 30,839.64 and 4,977.36 is: 7,466.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,559.78 : 30,839.64 = 4,977.36 : x
  2. Step 2: Convert to fraction form
    20,559.78/30,839.64 = 4,977.36/x
  3. Step 3: Cross multiply
    20,559.78x = 30,839.64 × 4,977.36
  4. Step 4: Simplify right side
    20,559.78x = 153,499,990.55
  5. Step 5: Solve for x
    x = 153,499,990.55/20,559.78
  6. Step 6: Final answer
    x = 7,466.03

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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.