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Finding the Fourth Proportional to 13,480.85, 18,602.78 and 7,815.15

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Solution

The fourth proportional to 13,480.85, 18,602.78 and 7,815.15 is: 10,784.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,480.85 : 18,602.78 = 7,815.15 : x
  2. Step 2: Convert to fraction form
    13,480.85/18,602.78 = 7,815.15/x
  3. Step 3: Cross multiply
    13,480.85x = 18,602.78 × 7,815.15
  4. Step 4: Simplify right side
    13,480.85x = 145,383,477.04
  5. Step 5: Solve for x
    x = 145,383,477.04/13,480.85
  6. Step 6: Final answer
    x = 10,784.45

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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.