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Finding the Fourth Proportional to 28,591.50, 42,839.88 and 20,230.08

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Solution

The fourth proportional to 28,591.50, 42,839.88 and 20,230.08 is: 30,311.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,591.50 : 42,839.88 = 20,230.08 : x
  2. Step 2: Convert to fraction form
    28,591.50/42,839.88 = 20,230.08/x
  3. Step 3: Cross multiply
    28,591.50x = 42,839.88 × 20,230.08
  4. Step 4: Simplify right side
    28,591.50x = 866,654,199.59
  5. Step 5: Solve for x
    x = 866,654,199.59/28,591.50
  6. Step 6: Final answer
    x = 30,311.60

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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.