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Finding the Fourth Proportional to 28,142.20, 42,207.02 and 8,418.20

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Solution

The fourth proportional to 28,142.20, 42,207.02 and 8,418.20 is: 12,625.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,142.20 : 42,207.02 = 8,418.20 : x
  2. Step 2: Convert to fraction form
    28,142.20/42,207.02 = 8,418.20/x
  3. Step 3: Cross multiply
    28,142.20x = 42,207.02 × 8,418.20
  4. Step 4: Simplify right side
    28,142.20x = 355,307,135.76
  5. Step 5: Solve for x
    x = 355,307,135.76/28,142.20
  6. Step 6: Final answer
    x = 12,625.42

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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.