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Finding the Fourth Proportional to 43,755.80, 65,649.90 and 42,135.80

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Solution

The fourth proportional to 43,755.80, 65,649.90 and 42,135.80 is: 63,219.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,755.80 : 65,649.90 = 42,135.80 : x
  2. Step 2: Convert to fraction form
    43,755.80/65,649.90 = 42,135.80/x
  3. Step 3: Cross multiply
    43,755.80x = 65,649.90 × 42,135.80
  4. Step 4: Simplify right side
    43,755.80x = 2,766,211,056.42
  5. Step 5: Solve for x
    x = 2,766,211,056.42/43,755.80
  6. Step 6: Final answer
    x = 63,219.30

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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.