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Finding the Fourth Proportional to 20,615.40, 28,448.90 and 11,662.68

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Solution

The fourth proportional to 20,615.40, 28,448.90 and 11,662.68 is: 16,094.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,615.40 : 28,448.90 = 11,662.68 : x
  2. Step 2: Convert to fraction form
    20,615.40/28,448.90 = 11,662.68/x
  3. Step 3: Cross multiply
    20,615.40x = 28,448.90 × 11,662.68
  4. Step 4: Simplify right side
    20,615.40x = 331,790,358.74
  5. Step 5: Solve for x
    x = 331,790,358.74/20,615.40
  6. Step 6: Final answer
    x = 16,094.30

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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.