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Finding the Fourth Proportional to 13,389.80, 18,478.06 and 7,421.54

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Solution

The fourth proportional to 13,389.80, 18,478.06 and 7,421.54 is: 10,241.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,389.80 : 18,478.06 = 7,421.54 : x
  2. Step 2: Convert to fraction form
    13,389.80/18,478.06 = 7,421.54/x
  3. Step 3: Cross multiply
    13,389.80x = 18,478.06 × 7,421.54
  4. Step 4: Simplify right side
    13,389.80x = 137,135,661.41
  5. Step 5: Solve for x
    x = 137,135,661.41/13,389.80
  6. Step 6: Final answer
    x = 10,241.80

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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.