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Finding the Fourth Proportional to 13,489.80, 18,615.56 and 7,824.19

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Solution

The fourth proportional to 13,489.80, 18,615.56 and 7,824.19 is: 10,797.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,489.80 : 18,615.56 = 7,824.19 : x
  2. Step 2: Convert to fraction form
    13,489.80/18,615.56 = 7,824.19/x
  3. Step 3: Cross multiply
    13,489.80x = 18,615.56 × 7,824.19
  4. Step 4: Simplify right side
    13,489.80x = 145,651,678.40
  5. Step 5: Solve for x
    x = 145,651,678.40/13,489.80
  6. Step 6: Final answer
    x = 10,797.17

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1.5x scale

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.