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Finding the Fourth Proportional to 20,531.40, 30,745.90 and 16,435.40

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Solution

The fourth proportional to 20,531.40, 30,745.90 and 16,435.40 is: 24,612.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,531.40 : 30,745.90 = 16,435.40 : x
  2. Step 2: Convert to fraction form
    20,531.40/30,745.90 = 16,435.40/x
  3. Step 3: Cross multiply
    20,531.40x = 30,745.90 × 16,435.40
  4. Step 4: Simplify right side
    20,531.40x = 505,321,164.86
  5. Step 5: Solve for x
    x = 505,321,164.86/20,531.40
  6. Step 6: Final answer
    x = 24,612.11

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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.