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Finding the Fourth Proportional to 12,620.67, 18,931.64 and 4,828.88

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Solution

The fourth proportional to 12,620.67, 18,931.64 and 4,828.88 is: 7,243.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,620.67 : 18,931.64 = 4,828.88 : x
  2. Step 2: Convert to fraction form
    12,620.67/18,931.64 = 4,828.88/x
  3. Step 3: Cross multiply
    12,620.67x = 18,931.64 × 4,828.88
  4. Step 4: Simplify right side
    12,620.67x = 91,418,498.96
  5. Step 5: Solve for x
    x = 91,418,498.96/12,620.67
  6. Step 6: Final answer
    x = 7,243.55

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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.