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Finding the Fourth Proportional to 13,391.54, 18,480.42 and 7,423.64

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Solution

The fourth proportional to 13,391.54, 18,480.42 and 7,423.64 is: 10,244.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,391.54 : 18,480.42 = 7,423.64 : x
  2. Step 2: Convert to fraction form
    13,391.54/18,480.42 = 7,423.64/x
  3. Step 3: Cross multiply
    13,391.54x = 18,480.42 × 7,423.64
  4. Step 4: Simplify right side
    13,391.54x = 137,191,985.13
  5. Step 5: Solve for x
    x = 137,191,985.13/13,391.54
  6. Step 6: Final answer
    x = 10,244.68

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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.