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Finding the Fourth Proportional to 21,499.80, 32,249.70 and 18,907.80

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Solution

The fourth proportional to 21,499.80, 32,249.70 and 18,907.80 is: 28,361.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,499.80 : 32,249.70 = 18,907.80 : x
  2. Step 2: Convert to fraction form
    21,499.80/32,249.70 = 18,907.80/x
  3. Step 3: Cross multiply
    21,499.80x = 32,249.70 × 18,907.80
  4. Step 4: Simplify right side
    21,499.80x = 609,770,877.66
  5. Step 5: Solve for x
    x = 609,770,877.66/21,499.80
  6. Step 6: Final answer
    x = 28,361.70

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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.