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Finding the Fourth Proportional to 13,685.28, 18,885.28 and 7,717.12

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Solution

The fourth proportional to 13,685.28, 18,885.28 and 7,717.12 is: 10,649.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,685.28 : 18,885.28 = 7,717.12 : x
  2. Step 2: Convert to fraction form
    13,685.28/18,885.28 = 7,717.12/x
  3. Step 3: Cross multiply
    13,685.28x = 18,885.28 × 7,717.12
  4. Step 4: Simplify right side
    13,685.28x = 145,739,971.99
  5. Step 5: Solve for x
    x = 145,739,971.99/13,685.28
  6. Step 6: Final answer
    x = 10,649.40

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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.