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Finding the Fourth Proportional to 45,431.60, 68,147.40 and 43,390.40

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Solution

The fourth proportional to 45,431.60, 68,147.40 and 43,390.40 is: 65,085.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,431.60 : 68,147.40 = 43,390.40 : x
  2. Step 2: Convert to fraction form
    45,431.60/68,147.40 = 43,390.40/x
  3. Step 3: Cross multiply
    45,431.60x = 68,147.40 × 43,390.40
  4. Step 4: Simplify right side
    45,431.60x = 2,956,942,944.96
  5. Step 5: Solve for x
    x = 2,956,942,944.96/45,431.60
  6. Step 6: Final answer
    x = 65,085.60

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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.