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Finding the Fourth Proportional to 43,651.20, 65,476.80 and 31,987.20

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Solution

The fourth proportional to 43,651.20, 65,476.80 and 31,987.20 is: 47,980.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,651.20 : 65,476.80 = 31,987.20 : x
  2. Step 2: Convert to fraction form
    43,651.20/65,476.80 = 31,987.20/x
  3. Step 3: Cross multiply
    43,651.20x = 65,476.80 × 31,987.20
  4. Step 4: Simplify right side
    43,651.20x = 2,094,419,496.96
  5. Step 5: Solve for x
    x = 2,094,419,496.96/43,651.20
  6. Step 6: Final answer
    x = 47,980.80

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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.