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Finding the Fourth Proportional to 13,388.43, 18,476.18 and 7,420.21

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Solution

The fourth proportional to 13,388.43, 18,476.18 and 7,420.21 is: 10,239.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,388.43 : 18,476.18 = 7,420.21 : x
  2. Step 2: Convert to fraction form
    13,388.43/18,476.18 = 7,420.21/x
  3. Step 3: Cross multiply
    13,388.43x = 18,476.18 × 7,420.21
  4. Step 4: Simplify right side
    13,388.43x = 137,097,135.60
  5. Step 5: Solve for x
    x = 137,097,135.60/13,388.43
  6. Step 6: Final answer
    x = 10,239.97

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Double scale
Find fourth proportional to 13,389.43, 18,477.56 and 7,421.21
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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.