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Finding the Fourth Proportional to 13,396.92, 18,487.64 and 7,428.52

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Solution

The fourth proportional to 13,396.92, 18,487.64 and 7,428.52 is: 10,251.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,396.92 : 18,487.64 = 7,428.52 : x
  2. Step 2: Convert to fraction form
    13,396.92/18,487.64 = 7,428.52/x
  3. Step 3: Cross multiply
    13,396.92x = 18,487.64 × 7,428.52
  4. Step 4: Simplify right side
    13,396.92x = 137,335,803.49
  5. Step 5: Solve for x
    x = 137,335,803.49/13,396.92
  6. Step 6: Final answer
    x = 10,251.30

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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.