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Finding the Fourth Proportional to 13,685.26, 18,885.08 and 7,717.49

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Solution

The fourth proportional to 13,685.26, 18,885.08 and 7,717.49 is: 10,649.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,685.26 : 18,885.08 = 7,717.49 : x
  2. Step 2: Convert to fraction form
    13,685.26/18,885.08 = 7,717.49/x
  3. Step 3: Cross multiply
    13,685.26x = 18,885.08 × 7,717.49
  4. Step 4: Simplify right side
    13,685.26x = 145,745,283.04
  5. Step 5: Solve for x
    x = 145,745,283.04/13,685.26
  6. Step 6: Final answer
    x = 10,649.80

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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.