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Finding the Fourth Proportional to 12,420.68, 18,624.60 and 3,654.45

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Solution

The fourth proportional to 12,420.68, 18,624.60 and 3,654.45 is: 5,479.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,420.68 : 18,624.60 = 3,654.45 : x
  2. Step 2: Convert to fraction form
    12,420.68/18,624.60 = 3,654.45/x
  3. Step 3: Cross multiply
    12,420.68x = 18,624.60 × 3,654.45
  4. Step 4: Simplify right side
    12,420.68x = 68,062,669.47
  5. Step 5: Solve for x
    x = 68,062,669.47/12,420.68
  6. Step 6: Final answer
    x = 5,479.79

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.