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Finding the Fourth Proportional to 13,995.64, 20,996.38 and 7,420.04

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Solution

The fourth proportional to 13,995.64, 20,996.38 and 7,420.04 is: 11,131.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,995.64 : 20,996.38 = 7,420.04 : x
  2. Step 2: Convert to fraction form
    13,995.64/20,996.38 = 7,420.04/x
  3. Step 3: Cross multiply
    13,995.64x = 20,996.38 × 7,420.04
  4. Step 4: Simplify right side
    13,995.64x = 155,793,979.46
  5. Step 5: Solve for x
    x = 155,793,979.46/13,995.64
  6. Step 6: Final answer
    x = 11,131.61

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.