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Finding the Fourth Proportional to 13,396.95, 18,487.76 and 7,428.47

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Solution

The fourth proportional to 13,396.95, 18,487.76 and 7,428.47 is: 10,251.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,396.95 : 18,487.76 = 7,428.47 : x
  2. Step 2: Convert to fraction form
    13,396.95/18,487.76 = 7,428.47/x
  3. Step 3: Cross multiply
    13,396.95x = 18,487.76 × 7,428.47
  4. Step 4: Simplify right side
    13,396.95x = 137,335,682.73
  5. Step 5: Solve for x
    x = 137,335,682.73/13,396.95
  6. Step 6: Final answer
    x = 10,251.26

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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.