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Finding the Fourth Proportional to 13,390.79, 18,479.30 and 7,422.53

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Solution

The fourth proportional to 13,390.79, 18,479.30 and 7,422.53 is: 10,243.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,390.79 : 18,479.30 = 7,422.53 : x
  2. Step 2: Convert to fraction form
    13,390.79/18,479.30 = 7,422.53/x
  3. Step 3: Cross multiply
    13,390.79x = 18,479.30 × 7,422.53
  4. Step 4: Simplify right side
    13,390.79x = 137,163,029.12
  5. Step 5: Solve for x
    x = 137,163,029.12/13,390.79
  6. Step 6: Final answer
    x = 10,243.09

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.