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Finding the Fourth Proportional to 28,136.66, 42,219.66 and 20,409.26

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Solution

The fourth proportional to 28,136.66, 42,219.66 and 20,409.26 is: 30,624.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,136.66 : 42,219.66 = 20,409.26 : x
  2. Step 2: Convert to fraction form
    28,136.66/42,219.66 = 20,409.26/x
  3. Step 3: Cross multiply
    28,136.66x = 42,219.66 × 20,409.26
  4. Step 4: Simplify right side
    28,136.66x = 861,672,018.05
  5. Step 5: Solve for x
    x = 861,672,018.05/28,136.66
  6. Step 6: Final answer
    x = 30,624.53

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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.