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Finding the Fourth Proportional to 13,489.40, 18,615.40 and 7,520.95

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Solution

The fourth proportional to 13,489.40, 18,615.40 and 7,520.95 is: 10,378.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,489.40 : 18,615.40 = 7,520.95 : x
  2. Step 2: Convert to fraction form
    13,489.40/18,615.40 = 7,520.95/x
  3. Step 3: Cross multiply
    13,489.40x = 18,615.40 × 7,520.95
  4. Step 4: Simplify right side
    13,489.40x = 140,005,492.63
  5. Step 5: Solve for x
    x = 140,005,492.63/13,489.40
  6. Step 6: Final answer
    x = 10,378.93

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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.