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Finding the Fourth Proportional to 13,489.44, 18,615.24 and 7,521

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Solution

The fourth proportional to 13,489.44, 18,615.24 and 7,521 is: 10,378.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,489.44 : 18,615.24 = 7,521 : x
  2. Step 2: Convert to fraction form
    13,489.44/18,615.24 = 7,521/x
  3. Step 3: Cross multiply
    13,489.44x = 18,615.24 × 7,521
  4. Step 4: Simplify right side
    13,489.44x = 140,005,220.04
  5. Step 5: Solve for x
    x = 140,005,220.04/13,489.44
  6. Step 6: Final answer
    x = 10,378.88

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Why These Related Problems?

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