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Finding the Fourth Proportional to 13,396.70, 18,487.88 and 7,428.93

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Solution

The fourth proportional to 13,396.70, 18,487.88 and 7,428.93 is: 10,252.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,396.70 : 18,487.88 = 7,428.93 : x
  2. Step 2: Convert to fraction form
    13,396.70/18,487.88 = 7,428.93/x
  3. Step 3: Cross multiply
    13,396.70x = 18,487.88 × 7,428.93
  4. Step 4: Simplify right side
    13,396.70x = 137,345,087.75
  5. Step 5: Solve for x
    x = 137,345,087.75/13,396.70
  6. Step 6: Final answer
    x = 10,252.16

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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.