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Finding the Fourth Proportional to 28,553.70, 42,830.55 and 15,431.70

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Solution

The fourth proportional to 28,553.70, 42,830.55 and 15,431.70 is: 23,147.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,553.70 : 42,830.55 = 15,431.70 : x
  2. Step 2: Convert to fraction form
    28,553.70/42,830.55 = 15,431.70/x
  3. Step 3: Cross multiply
    28,553.70x = 42,830.55 × 15,431.70
  4. Step 4: Simplify right side
    28,553.70x = 660,948,198.44
  5. Step 5: Solve for x
    x = 660,948,198.44/28,553.70
  6. Step 6: Final answer
    x = 23,147.55

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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.