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Finding the Fourth Proportional to 20,365.64, 28,105.64 and 11,412.60

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Solution

The fourth proportional to 20,365.64, 28,105.64 and 11,412.60 is: 15,749.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,365.64 : 28,105.64 = 11,412.60 : x
  2. Step 2: Convert to fraction form
    20,365.64/28,105.64 = 11,412.60/x
  3. Step 3: Cross multiply
    20,365.64x = 28,105.64 × 11,412.60
  4. Step 4: Simplify right side
    20,365.64x = 320,758,427.06
  5. Step 5: Solve for x
    x = 320,758,427.06/20,365.64
  6. Step 6: Final answer
    x = 15,749.98

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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.