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Finding the Fourth Proportional to 43,419.60, 65,086.20 and 20,005.20

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Solution

The fourth proportional to 43,419.60, 65,086.20 and 20,005.20 is: 29,987.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,419.60 : 65,086.20 = 20,005.20 : x
  2. Step 2: Convert to fraction form
    43,419.60/65,086.20 = 20,005.20/x
  3. Step 3: Cross multiply
    43,419.60x = 65,086.20 × 20,005.20
  4. Step 4: Simplify right side
    43,419.60x = 1,302,062,448.24
  5. Step 5: Solve for x
    x = 1,302,062,448.24/43,419.60
  6. Step 6: Final answer
    x = 29,987.90

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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.