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Finding the Fourth Proportional to 28,505.70, 42,711.81 and 20,144.88

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Solution

The fourth proportional to 28,505.70, 42,711.81 and 20,144.88 is: 30,184.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,505.70 : 42,711.81 = 20,144.88 : x
  2. Step 2: Convert to fraction form
    28,505.70/42,711.81 = 20,144.88/x
  3. Step 3: Cross multiply
    28,505.70x = 42,711.81 × 20,144.88
  4. Step 4: Simplify right side
    28,505.70x = 860,424,393.81
  5. Step 5: Solve for x
    x = 860,424,393.81/28,505.70
  6. Step 6: Final answer
    x = 30,184.29

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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.